(CFLAGS, LIBGCC2_CFLAGS): Delete overrides and comment why they were wrong.

From-SVN: r3761

gcc/config/m68k/x-apollo68

@@ -5,13 +5,8 @@
 CC=cc -g -A nansi -A cpu,3000 -A runtype,bsd4.3 -A systype,any -DSHORT_ENUM_BUG
 OLDCC=cc -g -A nansi -A cpu,3000 -A runtype,bsd4.3 -A systype,any -DSHORT_ENUM_BUG
 
-# Makefile.in has debugging turned on:
-#
-#    CFLAGS = -g
-#    LIBGCC2_CFLAGS = -O2 $(GCC_CFLAGS) -g1
-#
-# but that's not supported on the Apollo yet, so we'd better avoid
-# the warnings.
-
-CFLAGS =
-LIBGCC2_CFLAGS = -O2 $(GCC_CFLAGS)
+# This used to redefine CFLAGS and LIBGCC2_CFLAGS to eliminate the unsupported
+# -g flag from both macros.  This gives an undebugable stage1 compiler which
+# is bad, and it also does the wrong thing if we are cross compiling to a
+# target which does support debugging.  There is currently no way to avoid
+# the -g option that doesn't break something else.