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

gitportable/usr/share/vim/vim91/indent/c.vim

@@ -0,0 +1,16 @@
+" Vim indent file
+" Language:	C
+" Maintainer:	The Vim Project <https://github.com/vim/vim>
+" Last Change:	2023 Aug 10
+" Former Maintainer:	Bram Moolenaar <Bram@vim.org>
+
+" Only load this indent file when no other was loaded.
+if exists("b:did_indent")
+   finish
+endif
+let b:did_indent = 1
+
+" C indenting is built-in, thus this is very simple
+setlocal cindent
+
+let b:undo_indent = "setl cin<"