Fix build with Capstone 5 (#824)

Capstone 5 drops X86_INS_VCVTPD2DQX and X86_INS_VCVTPD2PSX from
x86.h (happened in capstone-engine/capstone@dd91f03
but no real explanation).

Given:
1. these instructions had no wiring up;
2. other Capstone consumers have done the same
let's drop them entirely as we have no idea what they are. They don't
appear in any Intel documentation and there's very little reference
to them online at all.

Bug: https://bugs.gentoo.org/843755
Closes: #823
Signed-off-by: Sam James <sam@gentoo.org>

Signed-off-by: Sam James <sam@gentoo.org>

src/capstone-edb/Instruction.cpp

@@ -880,8 +880,6 @@ bool is_SIMD_PD(const Operand &operand) {
 	case X86_INS_CVTPD2PI:
 	case X86_INS_CVTPD2PS:
 	case X86_INS_VCVTPD2PS:
-	case X86_INS_VCVTPD2DQX: // FIXME: what's this?
-	case X86_INS_VCVTPD2PSX: // FIXME: what's this?
 	// case X86_INS_VCVTPD2QQ: // FIXME: Capstone seems to not support it
 	case X86_INS_VCVTPD2UDQ:
 		// case X86_INS_VCVTPD2UQQ: // FIXME: Capstone seems to not support it