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

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

@@ -0,0 +1,15 @@
+" Vim compiler file
+" Compiler:	Microsoft Visual C
+" Maintainer:	The Vim Project <https://github.com/vim/vim>
+" Last Change:	2023 Aug 10
+"		2024 Apr 03 by The Vim Project (removed :CompilerSet definition)
+" Former Maintainer:	Bram Moolenaar <Bram@vim.org>
+
+if exists("current_compiler")
+  finish
+endif
+let current_compiler = "msvc"
+
+" The errorformat for MSVC is the default.
+CompilerSet errorformat&
+CompilerSet makeprg=nmake