go: fix musl build

srcpkgs/go/patches/no-longjmp-redefine.patch

@@ -0,0 +1,12 @@
+--- include/libc.h.orig
++++ include/libc.h
+@@ -102,7 +102,10 @@ extern	void	sysfatal(char*, ...);
+ #define atoll		p9atoll
+ #define getenv		p9getenv
+ #define	getwd		p9getwd
++#ifdef longjmp
++#undef longjmp
++#endif
+ #define	longjmp		p9longjmp
+ #undef  setjmp
+ #define setjmp		p9setjmp

srcpkgs/go/template

@@ -15,6 +15,8 @@ nostrip=yes
 noverifyrdeps=yes
 
 _go_targetarch() {
+	local hostarch targetarch
+
 	case "$XBPS_MACHINE" in
 		arm*) export hostarch=arm;;
 		i686*) export hostarch=386;;
@@ -32,7 +34,7 @@ _go_targetarch() {
 do_build() {
 	unset GCC CC CXX LD CFLAGS
 
-	targetarch=$(_go_targetarch)
+	local targetarch=$(_go_targetarch)
 	export GOROOT=$PWD
 	export GOROOT_FINAL="/usr/lib/go"
 	export GOOS=
@@ -66,6 +68,8 @@ do_build() {
 }
 
 do_install() {
+	local bindir
+
 	if [ "$CROSS_BUILD" ]; then
 		case "$XBPS_TARGET_MACHINE" in
 			arm*) bindir=bin/linux_arm;;
@@ -106,7 +110,7 @@ go-cross-linux_package() {
 	depends="${sourcepkg}-${version}_${revision}"
 	short_desc+=" - Cross compilers for Linux"
 	pkg_install() {
-		targetarch=$(_go_targetarch)
+		local targetarch=$(_go_targetarch)
 		mkdir -p $PKGDESTDIR/usr/lib/go/pkg/tool/
 		cd ${DESTDIR}/usr/lib/go/pkg/tool/
 		for i in linux_*; do