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>

runtime/compiler/bdf.vim

@@ -1,7 +1,8 @@
 " Vim compiler file
 " Compiler:             BDF to PCF Conversion
 " Previous Maintainer:  Nikolai Weibull <now@bitwi.se>
-" Latest Revision:      2006-04-19
+" Contributors:         Enno Nagel
+" Last Change:          2024 Mar 29
 
 if exists("current_compiler")
   finish
@@ -11,9 +12,12 @@ let current_compiler = "bdf"
 let s:cpo_save = &cpo
 set cpo-=C
 
-setlocal makeprg=bdftopcf\ $*
+if exists(":CompilerSet") != 2 " Older Vim always used :setlocal
+  command -nargs=* CompilerSet setlocal <args>
+endif
 
-setlocal errorformat=%ABDF\ %trror\ on\ line\ %l:\ %m,
+CompilerSet makeprg=bdftopcf\ $*
+CompilerSet errorformat=%ABDF\ %trror\ on\ line\ %l:\ %m,
       \%-Z%p^,
       \%Cbdftopcf:\ bdf\ input\\,\ %f\\,\ corrupt,
       \%-G%.%#