package/pkg-golang: disable version control information

By default go tries to include version control (VCS) information in
binaries. Since Buildroot separates version control from the build
process it is sensible to disable this behavior.

This avoids build errors when building with a git repository higher
up in the tree owned by root. In this case the go build system
calls `git status --porcelain` which returns with an error:
fatal: detected dubious ownership in repository at '/build'

Signed-off-by: Stefan Agner <stefan@agner.ch>
Reviewed-by: Christian Stewart <christian@paral.in>
Signed-off-by: Arnout Vandecappelle <arnout@mind.be>

package/pkg-golang.mk

@@ -45,7 +45,8 @@ $(2)_BUILD_OPTS += \
 	-modcacherw \
 	-tags "$$($(2)_TAGS)" \
 	-trimpath \
-	-p $$(PARALLEL_JOBS)
+	-p $$(PARALLEL_JOBS) \
+	-buildvcs=false
 
 # Target packages need the Go compiler on the host at download time (for
 # vendoring), and at build and install time.