Disable static compilation for OSX

scripts/build.sh

@@ -29,7 +29,6 @@ if [ "$(go env GOOS)" = "windows" ]; then
 fi
 
 ldflags="
-  -extldflags \"-static\"
   -X ${repo_path}/version.Version=${version}
   -X ${repo_path}/version.Revision=${revision}
   -X ${repo_path}/version.Branch=${branch}
@@ -37,6 +36,10 @@ ldflags="
   -X ${repo_path}/version.BuildDate=${build_date}
   -X ${repo_path}/version.GoVersion=${go_version}"
 
+if [ "$(go env GOOS)" != "darwin" ]; then
+	ldflags="${ldflags} -extldflags \"-static\""
+fi
+
 export GO15VENDOREXPERIMENT="1"
 
 echo " >   alertmanager"