[PATCH COMMITTED] Fix pretty printer failures when CPPFLAGS is defined with optimizations.

[Siddhesh Poyarekar]

On Saturday 24 December 2016 12:19 AM, Carlos O'Donell wrote:
> In my build scripts I use:
> 
> export CFLAGS="-g -O2 -Wl,--build-id=none"
> ...
> export CPPFLAGS="-g -O2 -Wl,--build-id=none"
> 
> The CPPFLAGS end up _after_ the per-test CFLAGS.
> 
> This means that the pretty printer tests compile at -O2 and fail.

-O2 is a C flag, not a cpp flag, so maybe the script is wrong?
Likewise, -Wl... flags ought to be in LDFLAGS.

Siddhesh