runtime(compilers): ensure compiler! sets global options (#14336)

Previously some options were only set locally by
&l:makeprg/errorformat

This suffices for :compiler (without a trailing bang)
but falls short for :compiler! that sets &g:makeprg/errorformat as
well

Also apply kind suggestions by @dkearns and @lifepillar 

Signed-off-by: Konfekt <Konfekt@users.noreply.github.com>
Signed-off-by: Doug Kearns <dougkearns@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/runtime/compiler/modelsim_vcom.vim b/runtime/compiler/modelsim_vcom.vim
index 6aa1bde..184b403 100644
--- a/runtime/compiler/modelsim_vcom.vim
+++ b/runtime/compiler/modelsim_vcom.vim
@@ -1,7 +1,8 @@
 " Vim Compiler File
 " Compiler:	Modelsim Vcom
 " Maintainer:	Paul Baleme <pbaleme@mail.com>
-" Last Change:	September 8, 2003
+" Contributors: Enno Nagel
+" Last Change:	2024 Mar 29
 " Thanks to:    allanherriman@hotmail.com
 
 if exists("current_compiler")
@@ -13,8 +14,9 @@
   command -nargs=* CompilerSet setlocal <args>
 endif
 
-"setlocal errorformat=\*\*\ %tRROR:\ %f(%l):\ %m,%tRROR:\ %f(%l):\ %m,%tARNING\[%*[0-9]\]:\ %f(%l):\ %m,\*\*\ %tRROR:\ %m,%tRROR:\ %m,%tARNING\[%*[0-9]\]:\ %m
+CompilerSet makeprg=vcom
 
+"setlocal errorformat=\*\*\ %tRROR:\ %f(%l):\ %m,%tRROR:\ %f(%l):\ %m,%tARNING\[%*[0-9]\]:\ %f(%l):\ %m,\*\*\ %tRROR:\ %m,%tRROR:\ %m,%tARNING\[%*[0-9]\]:\ %m
 "setlocal errorformat=%tRROR:\ %f(%l):\ %m,%tARNING\[%*[0-9]\]:\ %m
 CompilerSet errorformat=\*\*\ %tRROR:\ %f(%l):\ %m,\*\*\ %tRROR:\ %m,\*\*\ %tARNING:\ %m,\*\*\ %tOTE:\ %m,%tRROR:\ %f(%l):\ %m,%tARNING\[%*[0-9]\]:\ %f(%l):\ %m,%tRROR:\ %m,%tARNING\[%*[0-9]\]:\ %m