Small typo in iconv.m4

[Hafiz Abid Qadeer]

Hi All,
I was investigating a character set related problem with windows hosted
GDB and I tracked it down to a typo in iconv.m4. This typo caused
libiconv detection to fail and related support was not built into gdb.

The problem is with the following line.
CPPFLAGS="$LIBS $INCICONV"
which should have been
CPPFLAGS="$CPPFLAGS $INCICONV"

OK to commit the attached patch?

2018-11-06  Hafiz Abid Qadeer  <abidh@codesourcery.com>

	* config/iconv.m4 (AM_ICONV_LINK): Don't overwrite CPPFLAGS.
	Append $INCICONV to it.
	* gcc/configure: Regenerate.
	* libcpp/configure: Likewise.
	* libstdc++-v3/configure: Likewise.
	* intl/configure: Likewise.

Thanks,
-- 
Hafiz Abid Qadeer
Mentor Embedded/CodeSourcery
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