build: autodetect if cxx bindings or mono is build

if it is - build the examples, if not - don't add the examples to the
subprojects that are build.

setup.py

@@ -1,12 +1,22 @@
 #!/usr/bin/python3
 import os
+import subprocess
 from string import Template
 
-supported_languages = ["c", "csharp", "cxx"]
+supported_languages = ["c"]
 directories = ["apps", "reference", "tutorial"] # "examples", "legacy-examples"
 goals = []
 subprojects = []
 
+if subprocess.call("pkg-config --exists efl-mono", shell=True) == 0:
+  supported_languages += ["csharp"]
+else:
+  print("Disable c# bindings")
+if subprocess.call("pkg-config --exists eina-cxx", shell=True) == 0:
+  supported_languages += ["cxx"]
+else:
+  print("Disable c++ bindings")
+
 class SubProjectGoal:
   def __init__(self, language, path):
     self.language = language