micro: fix broken resource bundling.

The v2.0.11 update changed the way resources are bundled, now requiring an
additional step to 'generate' the bundle. Since I happened to only test the
original update on files that I have custom syntax for, I only realised the
presence of the regression after the update got merged (#38402).

srcpkgs/micro/template

@@ -1,7 +1,7 @@
 # Template file for 'micro'
 pkgname=micro
 version=2.0.11
-revision=1
+revision=2
 build_style=go
 go_import_path="github.com/zyedidia/micro/v2"
 go_package="${go_import_path}/cmd/micro"
@@ -15,6 +15,10 @@ homepage="https://micro-editor.github.io"
 distfiles="https://github.com/zyedidia/micro/archive/v${version}.tar.gz"
 checksum=1bb499edeaaadf1fe1791a49f96ab672c4e1add31ee125882ccd85a0fc8a4abe
 
+pre_build() {
+	GOARCH= go generate ./runtime
+}
+
 post_install() {
 	vlicense LICENSE
 	vman assets/packaging/micro.1