Zend/zend_cpuinfo, ext/standard/crc32_x86: fix -Wstrict-prototypes

In plain C, a function without arguments must be explicitly declared
(void).

Close GH-10528

Avoid possible [-Wstrict-prototypes] build warnings

Avoid direct calls to zend_cpu_supports()

While the use of zend_cpu_supports_*() is only strictly necessary
inside ifunc resolvers, where the cpu state has not been initialized
yet,

Avoid direct calls to zend_cpu_supports()

While the use of zend_cpu_supports_*() is only strictly necessary
inside ifunc resolvers, where the cpu state has not been initialized
yet, we should prefer the compiler builtins in all cases.

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X86: Fast CRC32 computation using PCLMULQDQ instruction

Based on:
"Fast CRC Computation for Generic Polynomials Using PCLMULQDQ Instruction"
V. Gopal, E. Ozturk, et al., 2009, http:/

X86: Fast CRC32 computation using PCLMULQDQ instruction

Based on:
"Fast CRC Computation for Generic Polynomials Using PCLMULQDQ Instruction"
V. Gopal, E. Ozturk, et al., 2009, http://intel.ly/2ySEwL0

Signed-off-by: Frank Du <frank.du@intel.com>

Closes GH-6018

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