mini-freeze of autotools-governed files in GCC and src

[Ralf Wildenhues]

Please refrain from committing changes to autotools-governed files
(their input files such as configure.ac, Makefile.am, *.m4 macro files,
and their products configure, aclocal.m4, ...) for the next few hours,
to the GCC, the binutils, and the gdb trees.

I'll announce the end of this mini-freeze after moving the trees to use
2.64/1.11.

Thank you,
Ralf