libsrc/utils: Do not catch SIGILL signal (#1435)

libcrypto performs cpu feature checks on ARM platforms, by calling `OPENSSL_cpuid_setup`.
In there, it tries to call various instructions and traps `illegal instructions` aka. non-existing instructions itself.

However, as hyperion.ng also tries to trap all signals, the call inside libcrypto is propagated and hyperiond gets killed by itself.

This patch lets execution proceed, even when `SIGILL` occurs.

References:
- libcrypto OPENSSL_cpuid_setup: 954f45ba4c/crypto/armcap.c (L183)

CHANGELOG.md

@@ -38,6 +38,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Qt-Grabber: Fixed position handling of multiple monitors (#1320, #1403)
 - Fixed: Signal detection does not switch off all instances (#1281)
 - Reworked PriorityMuxer and Sub-scriptions
+- Do not kill application on SIGILL-signal (#1435)
 
 ## Removed
 

libsrc/utils/DefaultSignalHandler.cpp

@@ -26,7 +26,6 @@ const Signal ALL_SIGNALS[] = {
 	{ SIGABRT, "SIGABRT" },
 	{ SIGBUS,  "SIGBUS"  },
 	{ SIGFPE,  "SIGFPE"  },
-	{ SIGILL,  "SIGILL"  },
 	{ SIGSEGV, "SIGSEGV" },
 	{ SIGTERM, "SIGTERM" },
 	{ SIGHUP,  "SIGHUP"  },