Build: Unify windows and linux find executable code

Configure.py

@@ -49,23 +49,11 @@ DEFAULT_ERROR_MESSAGE = (
 
 
 def FindExecutable(candidates : list):
-  if os.name == 'nt':
-    # TODO: test if find_executable(e) works properly for windows and unify windows and linux code if works
-    for e in candidates:
-      ec = subprocess.call(
-        [ 'where' if os.name == 'nt' else 'whereis', e ],
-        stdout = subprocess.PIPE,
-        stderr = subprocess.PIPE,
-        shell = True)
-      if ec == 0:
-        return e
-    return None
-  else:
-    for e in candidates:
-      find_executable(e)
-      if e:
-        return e
-    return None    
+  for e in candidates:
+    executable_path = find_executable(e)
+    if executable_path:
+      return e
+  return None
 
 DEFAULT_C_COMPILER = FindExecutable([
   'cl',