Match xplat event source conditions (#56435)

Author: am11

src/coreclr/clr.featuredefines.props

@@ -14,7 +14,7 @@
     </PropertyGroup>
 
     <PropertyGroup Condition="'$(TargetsUnix)' == 'true'">
-        <FeatureXplatEventSource Condition="'$(TargetOS)'!='OSX'">true</FeatureXplatEventSource>
+        <FeatureXplatEventSource Condition="'$(TargetOS)' == 'Linux'">true</FeatureXplatEventSource>
 
         <FeatureArrayStubAsIL>true</FeatureArrayStubAsIL>
         <FeatureMulticastStubAsIL>true</FeatureMulticastStubAsIL>

src/coreclr/vm/ecall.cpp

@@ -659,6 +659,13 @@ LPVOID ECall::GetQCallImpl(MethodDesc * pMD)
     if (id == 0)
     {
         id = ECall::GetIDForMethod(pMD);
+
+#ifdef _DEBUG
+        CONSISTENCY_CHECK_MSGF(id != 0,
+            ("%s::%s is not registered in ecall.cpp",
+            pMD->m_pszDebugClassName, pMD->m_pszDebugMethodName));
+#endif
+
         _ASSERTE(id != 0);
 
         // Cache the id