Solving the following compile time error

error: moving ‘a’ of type ‘arduino::String’ to itself [-Werror=self-move]
Which may happen if if GCC_VERSION is not defined, and instead __GNUC__
is defined

Author: andreagilardoni

Diff for: test/src/String/test_move.cpp

@@ -37,14 +37,16 @@ TEST_CASE("Testing String move assignment", "[String-move-02]")
 
 TEST_CASE("Testing String move self assignment", "[String-move-03]")
 {
-#if (defined(GCC_VERSION) && GCC_VERSION >= 13) || (defined(__clang_major__) && __clang_major__ >= 14)
+#if (defined(GCC_VERSION) && GCC_VERSION >= 13) || (defined(__clang_major__) && __clang_major__ >= 14) \
+    || (defined(__GNUC__) && __GNUC__ >= 13)
 #pragma GCC diagnostic push
 #pragma GCC diagnostic ignored "-Wself-move"
 #endif
     arduino::String a("src");
     a = std::move(a);
     REQUIRE(a == "src");
-#if defined(GCC_VERSION) && GCC_VERSION >= 13
+#if defined(GCC_VERSION) && GCC_VERSION >= 13 || (defined(__clang_major__) && __clang_major__ >= 14) \
+    || (defined(__GNUC__) && __GNUC__ >= 13)
 #pragma GCC diagnostic pop
 #endif
 }