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

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

@@ -0,0 +1,23 @@
+" Vim compiler file
+" Compiler:	Java Development Kit Compiler
+" Maintainer:	Doug Kearns <dougkearns@gmail.com>
+" Last Change:	2024 Nov 19 (enable local javac_makeprg_params)
+
+if exists("current_compiler")
+  finish
+endif
+let current_compiler = "javac"
+
+let s:cpo_save = &cpo
+set cpo&vim
+
+execute $'CompilerSet makeprg=javac\ {escape(get(b:, 'javac_makeprg_params', get(g:, 'javac_makeprg_params', '')), ' \|"')}'
+
+CompilerSet errorformat=%E%f:%l:\ error:\ %m,
+		       \%W%f:%l:\ warning:\ %m,
+		       \%-Z%p^,
+		       \%-C%.%#,
+		       \%-G%.%#
+
+let &cpo = s:cpo_save
+unlet s:cpo_save