made the pack completely portable and wrote relevent bat files to go with it

gitportable/usr/share/vim/vim91/compiler/zig_test.vim

@@ -0,0 +1,23 @@
+" Vim compiler file
+" Compiler: Zig Compiler (zig test)
+" Upstream: https://github.com/ziglang/zig.vim
+" Last Change: 2024 Apr 05 by The Vim Project (removed :CompilerSet definition)
+
+if exists('current_compiler')
+  finish
+endif
+runtime compiler/zig.vim
+let current_compiler = 'zig_test'
+
+let s:save_cpo = &cpo
+set cpo&vim
+
+if has('patch-7.4.191')
+  CompilerSet makeprg=zig\ test\ \%:S\ \$* 
+else
+  CompilerSet makeprg=zig\ test\ \"%\"\ \$* 
+endif
+
+let &cpo = s:save_cpo
+unlet s:save_cpo
+" vim: tabstop=8 shiftwidth=4 softtabstop=4 expandtab