cc/gcc: add option to enable/disable libmudflap

For some scenarii, libmudflap is not very usefull
or can break the build. Make in an optioon that
defaults to 'N' to be on the safe side.

For the core gcc-s, there is absolutely no need
to build libmidflap.

Idea from: Bernhard Pfund <bernhard@chapter7.ch>

syntax: glob

# Generated files

Makefile

ct-ng

docs/ct-ng.1

docs/ct-ng.1.gz

paths.mk

scripts/crosstool-NG.sh

scripts/saveSample.sh

scripts/showTuple.sh

# Temporaries

.*.swp

log.*

# Working files

kconfig/conf

kconfig/mconf

kconfig/**.o

kconfig/**.dep

config.gen/

.config

.config.old

targets/