re PR libgcj/19877 (sometimes reconfiguring leads to incorrect config.h)

config/:
	PR libgcj/19877:
	* no-executables.m4: Call real AC_FUNC_MMAP when cache variable
	is set but not 'no'.
libstdc++-v3/:
	PR libgcj/19877:
	* configure, aclocal.m4: Rebuilt.
	* Makefile.in, include/Makefile.in, libmath/Makefile.in,
	libsupc++/Makefile.in, po/Makefile.in, src/Makefile.in,
	testsuite/Makefile.in: Likewise.
libjava/:
	PR libgcj/19877:
	* configure, aclocal.m4, Makefile.in: Rebuilt.
libgfortran/:
	PR libgcj/19877:
	* configure, aclocal.m4, Makefile.in: Rebuilt.
zlib/:
	PR libgcj/19877:
	* configure, aclocal.m4, Makefile.in: Rebuilt.

From-SVN: r100953