Bug fix.
Description:
MIPSpro Compiler 7.4.x starts to support C99 features
but stdint.h has a "guard" in it that will #error if
cc is invoked without asking for C99 standard. But it
does not result with a non-zero compiler exit code, thus
configure thought it is okay to use header file stdint.h.
This causes problems later.
Solution:
Default to use the C99 compiler if available.
Platforms tested:
Tested in Sandia tesla machine which is a new SGI machine.
2d2522f666