[Patch] Remove some unused checks from configure.

[David Daney]

Inspired by Tom Tromey's recent post to gcc@, I did a little grepping 
and found some unused configure checks.  Removing these significantly 
reduces GCC bootstrap times (usually be a second or more) :-).

Tested on x86_64-pc-linux-gnu with no regressions.

OK to commit?

2006-03-23  David Daney  <ddaney@avtrex.com>

    * configure.ac: Remove checks for mktime, alloca, ioctl, gmtime_r,
    fork, execvp, execinfo.h, pthread_mutexattr_settype,
    pthread_mutexattr_setkind_np and sys/wait.h.
    * Makefile.in: Regenerate.
    * include/Makefile.in: Regenerate.
    * include/config.h.in: Regenerate.
    * testsuite/Makefile.in: Regenerate.
    * configure: Regenerate.
    * gcj/Makefile.in: Regenerate.

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