$CC and intel icc/ecc compiler

[Samuel Meder]

Switching from $cc_basename to $CC breaks the case where $CC is set to
the full path of the compiler. This can either be fixed by switching
back to $cc_basename and adding a line defining it to
_LT_AC_LANG_C_CONFIG or by switching $CC to `basename $CC`. I've
attached a patch that does the later. If people prefer the former please
let me know.

/Sam

ChangeLog.patch
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libtool.patch
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