Allow the use of non-Apple compilers #2777
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Pre-compiled headers was a performance optimisation available in Apple's legacy compilers. It was never available in stock GCC and now prevents nmap from being built with stock GCC since -no-cpp-precomp is not a recognised option.
Leave the option in should someone wants to try enabling it.
Allows nmap to be built on OS X 10.4 powerpc with stock GCC 5.5