Remove HAVE_SIGNAL_H symbol #2
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The signal.h header is part of the C89 standard and is present on all today's systems already. The HAVE_SIGNAL_H symbol is defined by PHP's build system and relying on it is neither a good practice neither needed anymore since the signal.h check would always define it.
http://port70.net/~nsz/c/c89/c89-draft.html#4.1.2
Related to removal via php/php-src#4298