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

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

@@ -0,0 +1,25 @@
+" Vim compiler file
+" Compiler: Zig Compiler (zig build)
+" 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_build'
+
+let s:save_cpo = &cpo
+set cpo&vim
+
+if exists('g:zig_build_makeprg_params')
+	execute 'CompilerSet makeprg=zig\ build\ '.escape(g:zig_build_makeprg_params, ' \|"').'\ $*'
+else
+	CompilerSet makeprg=zig\ build\ $*
+endif
+
+" TODO: anything to add to errorformat for zig build specifically?
+
+let &cpo = s:save_cpo
+unlet s:save_cpo
+" vim: tabstop=8 shiftwidth=4 softtabstop=4 expandtab