Merge pull request #2274 from DmitryTsyganov/error_message_fix

Add CompilerError constructor that accepts const char* as a parameter (Fixes #2273)

spirv_cross_error_handling.hpp

@@ -66,6 +66,11 @@ public:
 	    : std::runtime_error(str)
 	{
 	}
+
+	explicit CompilerError(const char *str)
+	    : std::runtime_error(str)
+	{
+	}
 };
 
 #define SPIRV_CROSS_THROW(x) throw CompilerError(x)