otto: fix cross-compilation

srcpkgs/otto/template

@@ -17,13 +17,13 @@ do_build() {
 	mkdir -p "$(dirname ${path})"
 	ln -fs $PWD "${path}"
 
-    cd "$GOPATH/src/$go_import_path"
-	make updatedeps
-    PATH=$GOPATH/bin:$PATH make generate
-    go install
+	cd "$GOPATH/src/$go_import_path"
+	GOOS= GOARCH= GOARM= make updatedeps
+	PATH=$GOPATH/bin:$PATH make generate
+	go install
 }
 
 post_install() {
-    rm $DESTDIR/usr/bin/{go-bindata,gox,stringer}
+	rm $DESTDIR/usr/bin/{go-bindata,gox,stringer}
 	vlicense LICENSE
 }