c-ares: use our compilation flags

If not requested otherwise as ./configure option, c-ares will strip
any -g from CFLAGS / CPPFLAGS and add -g0 instead, disabling all
debug info.
Similarly, it will try to enable optimisation (but bail out since in
that case it honors an existing -O in CFLAGS / CPPFLAGS)

Since we want to control code generation, patch out the code
mangling -g (and -O for consistency). Alternatively, if we were to
pass --enable-debug to ./configure, c-ares would at the same time
assume that we don't want optimisation anymore.

Signed-off-by: André Draszik <adraszik@tycoint.com>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>
Signed-off-by: Joe MacDonald <joe_macdonald@mentor.com>

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