Better Ninja detection.

environment.py

@@ -1507,10 +1507,8 @@ def find_valgrind():
 
 def detect_ninja():
     for n in ['ninja', 'ninja-build']:
-        # Plain 'ninja' or 'ninja -h' yields an error
-        # code. Thanks a bunch, guys.
         try:
-            p = subprocess.Popen([n, '-t', 'list'], stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL)
+            p = subprocess.Popen([n, '--version'], stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL)
         except FileNotFoundError:
             continue
         p.communicate()

ninjabackend.py

@@ -1392,7 +1392,7 @@ rule FORTRAN_DEP_HACK
 
         ninja_command = environment.detect_ninja()
         if ninja_command is None:
-            raise RuntimeError('Could not detect ninja command')
+            raise MesonException('Could not detect ninja command')
         elem = NinjaBuildElement('clean', 'CUSTOM_COMMAND', 'PHONY')
         elem.add_item('COMMAND', [ninja_command, '-t', 'clean'])
         elem.add_item('description', 'Cleaning')