fix compile error with capstone_static_winkernel

The MSVC project capstone_static_winkernel uses __stdcall as a
default calling convention to fit with environment for Windows driver
development. This leads to a compile error in a use of qsort() with
regs_cmp() since it is compiled as a __stdcall function while qsort()
expects a __cdelc function.

This fix adds explicit calling convention to regs_cmp() for MSVC.

Signed-off-by: Satoshi Tanda <[email protected]>

arch/X86/X86Mapping.c

@@ -2923,7 +2923,7 @@ static struct insn_reg2 insn_regs_intel2[] = {
 
 static struct insn_reg insn_regs_intel_sorted [ARR_SIZE(insn_regs_intel)];
 
-static int regs_cmp(const void *a, const void *b)
+static int CAPSTONE_API regs_cmp(const void *a, const void *b)
 {
 	uint16_t l = ((struct insn_reg *)a)->insn;
 	uint16_t r = ((struct insn_reg *)b)->insn;