Remove some hardcoded optimization/warnings flags.  This will become obsolete
with the next release.

--- backup/libcd64/Makefile.orig	2020-12-26 22:52:19 UTC
+++ backup/libcd64/Makefile
@@ -1,11 +1,11 @@
 CC=gcc
 
 # I think we only use gnu99 instead of c99 due to va_args extensions.
-CFLAGS+=-I. -Wall -W -Wno-format-truncation -std=gnu99
+CFLAGS+=-I. -Wall -W -std=gnu99
 ifdef DEBUG
 CFLAGS+=-pg -g -pedantic -ansi -DDEBUG
 else
-CFLAGS+=-O6 -funroll-loops -fexpensive-optimizations
+CFLAGS+=-funroll-loops
 endif
 
 ifndef DJGPP