mostly cosmetic changes for the new romfs compress/compile feature

SConstruct

@@ -234,6 +234,11 @@ if romfsmode not in ['verbatim', 'compile', 'compress']:
 # Build the compilation command now
 compcmd = ''
 if romfsmode == 'compile':
+  # First check for luac.cross in the current directory
+  if not os.path.isfile( "luac.cross" ):
+    print "The eLua cross compiler was not found."
+    print "Build it by running 'scons -f cross-lua.py'"
+    sys.exit( -1 )
   compcmd = './luac.cross -ccn %s -cce %s -o %%s -s %%s' % ( toolset[ 'cross_%s' % target ], toolset[ 'cross_cpumode' ] )
 elif romfsmode == 'compress':
   compcmd = 'lua luasrcdiet.lua --quiet --maximum --opt-comments --opt-whitespace --opt-emptylines --opt-eols --opt-strings --opt-numbers --opt-locals -o %s %s'

mkfs.py

@@ -75,12 +75,13 @@ def mkfs( dirname, outname, flist, mode, compcmd ):
       return False
     
     # Do we need to process the file?
+    fextpart = ''
     if mode == "compile" or mode == "compress":
       fnamepart, fextpart = os.path.splitext( realname )
       if mode == "compress":
         newext = ".lua.tmp"
       else:
-        newext = ".luac"
+        newext = ".lc"
       if fextpart == ".lua":
         newname = fnamepart + newext
         if mode == "compress":
@@ -102,9 +103,8 @@ def mkfs( dirname, outname, flist, mode, compcmd ):
           fname = fnamepart + ".lc"
     filedata = crtfile.read()
     crtfile.close()
-    if mode == 'compile' or mode == "compress":
-      if fextpart == ".lua":
-        os.remove( newname )
+    if fextpart == ".lua" and mode != "verbatim":
+      os.remove( newname )
 
     # Write name, size, id, numpars
     for c in fname: