release: build with consistent paths

This changes the builds to always add -trimpath which removes specific
build time paths from the binary (like current directories etc).

Improves build reproducability to make the final binary independent from
the specific build path.

Lastly, when stripping debug symbols, also add -w to strip DWARF symbols
as well which aren't needed in that case either.

Signed-off-by: Dirkjan Bussink <d.bussink@gmail.com>

scripts/build-binary

@@ -87,7 +87,7 @@ function main {
       export GOARCH=${TARGET_ARCH}
 
       pushd etcd >/dev/null
-      GO_LDFLAGS="-s" ./build.sh
+      GO_LDFLAGS="-s -w" ./build.sh
       popd >/dev/null
 
       TARGET="etcd-${VER}-${GOOS}-${GOARCH}"