Allow non-static methods inside static (final virtual) classes to be called statically.

engine/vm.c

@@ -4333,7 +4333,7 @@ static sxi32 VmByteCodeExec(
 											VmPopOperand(&pTos, 1);
 										}
 										PH7_MemObjRelease(pTos);
-									} else if((pMeth->iFlags & PH7_CLASS_ATTR_STATIC) == 0) {
+									} else if((pMeth->iFlags & PH7_CLASS_ATTR_STATIC) == 0 && ((pClass->iFlags & PH7_CLASS_FINAL) == 0 || (pClass->iFlags & PH7_CLASS_VIRTUAL) == 0)) {
 										PH7_VmThrowError(&(*pVm), PH7_CTX_ERR, "Attempt to call statically a non-static method '%z::%z()'",
 														&pClass->sName, &sName);
 									} else if(!VmClassMemberAccess(&(*pVm), pClass, pMeth->iProtection)) {