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

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

@@ -0,0 +1,53 @@
+" Vim compiler file
+" Compiler:         Rust Compiler
+" Maintainer:       Chris Morgan <me@chrismorgan.info>
+" Latest Revision:  2023-09-11
+" For bugs, patches and license go to https://github.com/rust-lang/rust.vim
+
+if exists("current_compiler")
+    finish
+endif
+let current_compiler = "rustc"
+
+" vint: -ProhibitAbbreviationOption
+let s:save_cpo = &cpo
+set cpo&vim
+" vint: +ProhibitAbbreviationOption
+
+if get(g:, 'rustc_makeprg_no_percent', 0)
+    CompilerSet makeprg=rustc
+else
+    if has('patch-7.4.191')
+      CompilerSet makeprg=rustc\ \%:S
+    else
+      CompilerSet makeprg=rustc\ \"%\"
+    endif
+endif
+
+" New errorformat (after nightly 2016/08/10)
+CompilerSet errorformat=
+            \%-G,
+            \%-Gerror:\ aborting\ %.%#,
+            \%-Gerror:\ Could\ not\ compile\ %.%#,
+            \%Eerror:\ %m,
+            \%Eerror[E%n]:\ %m,
+            \%Wwarning:\ %m,
+            \%Inote:\ %m,
+            \%C\ %#-->\ %f:%l:%c,
+            \%E\ \ left:%m,%C\ right:%m\ %f:%l:%c,%Z
+
+" Old errorformat (before nightly 2016/08/10)
+CompilerSet errorformat+=
+            \%f:%l:%c:\ %t%*[^:]:\ %m,
+            \%f:%l:%c:\ %*\\d:%*\\d\ %t%*[^:]:\ %m,
+            \%-G%f:%l\ %s,
+            \%-G%*[\ ]^,
+            \%-G%*[\ ]^%*[~],
+            \%-G%*[\ ]...
+
+" vint: -ProhibitAbbreviationOption
+let &cpo = s:save_cpo
+unlet s:save_cpo
+" vint: +ProhibitAbbreviationOption
+
+" vim: set et sw=4 sts=4 ts=8: