gh-96398: python3: use cc_basename instead of CC when checking binary name #96399
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When paths contain "clang"/"gcc"/"icc", they might be part of $CC
for example because of the "--sysroot" parameter. That could cause
judgement error about clang/gcc/icc compilers. e.g.
when "icc" is containded in working path, below errors are reported when
compiling python3:
x86_64-wrs-linux-gcc: error: strict: No such file or directory
x86_64-wrs-linux-gcc: error: unrecognized command line option '-fp-model'