Add Apple silicon cgo flags

This makes 'go install' work on Apple silicon out of the box after installing the dependencies with brew on a freshly installed machine.

audio/al/al.go

@@ -6,14 +6,16 @@
 // The OpenAL documentation can be accessed at https://openal.org/documentation/
 package al
 
-// #cgo darwin   CFLAGS:  -DGO_DARWIN  -I/usr/local/opt/openal-soft/include/AL -I/usr/include/AL
-// #cgo freebsd  CFLAGS:  -DGO_FREEBSD -I/usr/local/include/AL
-// #cgo linux    CFLAGS:  -DGO_LINUX   -I/usr/include/AL
-// #cgo windows  CFLAGS:  -DGO_WINDOWS -I${SRCDIR}/../windows/openal-soft-1.18.2/include/AL
-// #cgo darwin   LDFLAGS: -L/usr/local/opt/openal-soft/lib -lopenal
-// #cgo freebsd  LDFLAGS: -L/usr/local/lib -lopenal
-// #cgo linux    LDFLAGS: -lopenal
-// #cgo windows  LDFLAGS: -L${SRCDIR}/../windows/bin -lOpenAL32
+// #cgo darwin,amd64  CFLAGS:  -DGO_DARWIN  -I/usr/local/opt/openal-soft/include/AL -I/usr/include/AL
+// #cgo darwin,arm64  CFLAGS:  -DGO_DARWIN  -I/opt/homebrew/opt/openal-soft/include/AL
+// #cgo freebsd       CFLAGS:  -DGO_FREEBSD -I/usr/local/include/AL
+// #cgo linux         CFLAGS:  -DGO_LINUX   -I/usr/include/AL
+// #cgo windows       CFLAGS:  -DGO_WINDOWS -I${SRCDIR}/../windows/openal-soft-1.18.2/include/AL
+// #cgo darwin,amd64  LDFLAGS: -L/usr/local/opt/openal-soft/lib -lopenal
+// #cgo darwin,arm64  LDFLAGS: -L/opt/homebrew/opt/openal-soft/lib -lopenal
+// #cgo freebsd       LDFLAGS: -L/usr/local/lib -lopenal
+// #cgo linux         LDFLAGS: -lopenal
+// #cgo windows       LDFLAGS: -L${SRCDIR}/../windows/bin -lOpenAL32
 // #include <stdlib.h>
 // #include "al.h"
 // #include "alc.h"

audio/ov/vorbisfile.go

@@ -6,14 +6,16 @@
 // The libvorbisfile C API reference is at: https://xiph.org/vorbis/doc/vorbisfile/reference.html
 package ov
 
-// #cgo darwin   CFLAGS:  -DGO_DARWIN  -I/usr/include/vorbis -I/usr/local/include/vorbis
-// #cgo freebsd  CFLAGS:  -DGO_FREEBSD -I/usr/include/vorbis -I/usr/local/include/vorbis
-// #cgo linux    CFLAGS:  -DGO_LINUX   -I/usr/include/vorbis
-// #cgo windows  CFLAGS:  -DGO_WINDOWS -I${SRCDIR}/../windows/libvorbis-1.3.5/include/vorbis -I${SRCDIR}/../windows/libogg-1.3.3/include
-// #cgo darwin   LDFLAGS: -L/usr/lib -L/usr/local/lib -lvorbisfile
-// #cgo freebsd  LDFLAGS: -L/usr/lib -L/usr/local/lib -lvorbisfile
-// #cgo linux    LDFLAGS: -lvorbisfile
-// #cgo windows  LDFLAGS: -L${SRCDIR}/../windows/bin -llibvorbisfile
+// #cgo darwin,amd64  CFLAGS:  -DGO_DARWIN  -I/usr/include/vorbis -I/usr/local/include/vorbis
+// #cgo darwin,arm64  CFLAGS:  -DGO_DARWIN  -I/opt/homebrew/include -I/opt/homebrew/include/vorbis
+// #cgo freebsd       CFLAGS:  -DGO_FREEBSD -I/usr/include/vorbis -I/usr/local/include/vorbis
+// #cgo linux         CFLAGS:  -DGO_LINUX   -I/usr/include/vorbis
+// #cgo windows       CFLAGS:  -DGO_WINDOWS -I${SRCDIR}/../windows/libvorbis-1.3.5/include/vorbis -I${SRCDIR}/../windows/libogg-1.3.3/include
+// #cgo darwin,amd64  LDFLAGS: -L/usr/lib -L/usr/local/lib -lvorbisfile
+// #cgo darwin,arm64  LDFLAGS: -L/opt/homebrew/lib -lvorbisfile
+// #cgo freebsd       LDFLAGS: -L/usr/lib -L/usr/local/lib -lvorbisfile
+// #cgo linux         LDFLAGS: -lvorbisfile
+// #cgo windows       LDFLAGS: -L${SRCDIR}/../windows/bin -llibvorbisfile
 // #include <stdlib.h>
 // #include "vorbisfile.h"
 import "C"

audio/vorbis/vorbis.go

@@ -6,14 +6,16 @@
 // See API reference at: https://xiph.org/vorbis/doc/libvorbis/reference.html
 package vorbis
 
-// #cgo darwin   CFLAGS:  -DGO_DARWIN  -I/usr/include/vorbis -I/usr/local/include/vorbis
-// #cgo freebsd  CFLAGS:  -DGO_FREEBSD -I/usr/local/include/vorbis
-// #cgo linux    CFLAGS:  -DGO_LINUX   -I/usr/include/vorbis
-// #cgo windows  CFLAGS:  -DGO_WINDOWS -I${SRCDIR}/../windows/libvorbis-1.3.5/include/vorbis -I${SRCDIR}/../windows/libogg-1.3.3/include
-// #cgo darwin   LDFLAGS: -L/usr/lib -L/usr/local/lib -lvorbis
-// #cgo freebsd  LDFLAGS: -L/usr/local/lib -lvorbis
-// #cgo linux    LDFLAGS: -lvorbis
-// #cgo windows  LDFLAGS: -L${SRCDIR}/../windows/bin -llibvorbis
+// #cgo darwin,amd64  CFLAGS:  -DGO_DARWIN  -I/usr/include/vorbis -I/usr/local/include/vorbis
+// #cgo darwin,arm64  CFLAGS:  -DGO_DARWIN  -I/opt/homebrew/include -I/opt/homebrew/include/vorbis
+// #cgo freebsd       CFLAGS:  -DGO_FREEBSD -I/usr/local/include/vorbis
+// #cgo linux         CFLAGS:  -DGO_LINUX   -I/usr/include/vorbis
+// #cgo windows       CFLAGS:  -DGO_WINDOWS -I${SRCDIR}/../windows/libvorbis-1.3.5/include/vorbis -I${SRCDIR}/../windows/libogg-1.3.3/include
+// #cgo darwin,amd64  LDFLAGS: -L/usr/lib -L/usr/local/lib -lvorbis
+// #cgo darwin,arm64  LDFLAGS: -L/opt/homebrew/lib -lvorbis
+// #cgo freebsd       LDFLAGS: -L/usr/local/lib -lvorbis
+// #cgo linux         LDFLAGS: -lvorbis
+// #cgo windows       LDFLAGS: -L${SRCDIR}/../windows/bin -llibvorbis
 // #include "codec.h"
 import "C"