[PATCH] libstdc++-v3/fragment.am (AM_CPPFLAGS): Add CPPFLAGS

[Michael Haubenwallner]

Hi build machinery maintainers,

when the host system does not have the iconv-devel package installed,
but the target-prefix does contain iconv.h, in libstdc++/include the
creation of the precompiled headers fails with "<iconv.h> not found".

While libstdc++/configure detects INCICONV="-I$target_prefix/include"
and adds this to CPPFLAGS, the Makefiles do not transfer CPPFLAGS to
the compiler commandline.

Attached patch adds CPPFLAGS to AM_CPPFLAGS in libstdc++/fragment.am.

Thanks!
/haubi/
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