[PATCH] Don't override CFLAGS_FOR_TARGET when optimising for size

[Bob Dunlop]

Hi,

This patch prevents optmizing for space overriding any other
CFLAGS_FOR_TARGET that may already be set.  Found when trying
to set -fno-omit-frame-pointer for compatability with some
in house code.

Simply append the space optimisation flags to the CFLAGS_FOR_TARGET
set rather than replacing.

Tested compiling newlib-2.0.0 for ARM with crosstool-NG-1.20.0 and
GNU Make 3.82.

Same patch for 2.1.0.


-- 
        Bob Dunlop
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