tests cxx: remove superfluous output to stdout

These outputs are not giving any more information besides what we already get:

Ecore C++ headers compilePASS: tests/ecore_cxx/cxx_compile_test

(Ignoring the problem with the newline) The test name tells it all and we are
just filling the log.

src/tests/ecore_audio_cxx/cxx_compile_test.cc

@@ -9,6 +9,5 @@
 
 int main()
 {
-   std::cout << "Ecore Audio C++ headers compile";
    return 0;
 }

src/tests/ecore_cxx/cxx_compile_test.cc

@@ -8,6 +8,5 @@
 
 int main()
 {
-   std::cout << "Ecore C++ headers compile";
    return 0;
 }

src/tests/edje_cxx/cxx_compile_test.cc

@@ -9,6 +9,5 @@
 
 int main()
 {
-   std::cout << "Edje C++ headers compile";
    return 0;
 }

src/tests/evas_cxx/cxx_compile_test.cc

@@ -10,6 +10,5 @@
 
 int main()
 {
-   std::cout << "Evas C++ headers compile";
    return 0;
 }