[PATCH, committed] Use more config/*.m4 macros

[Paolo Bonzini]

In particular, the warning macros and the ACX_CHECK_PROG_VER macro. 
Bootstrapped/regtested on i686-pc-linux-gnu.

config/acx.m4          |   4 -
gcc/Makefile.in        |  24 ++++++---
gcc/acinclude.m4       |  28 -----------
gcc/aclocal.m4         |   1
gcc/configure.ac       | 118 ++++++-------------------------------------
libiberty/aclocal.m4   |   1
libiberty/configure.ac |  22 ---------
7 files changed, 34 insertions(+), 164 deletions(-)

Paolo
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