ninjabackend: Remove duplicate vala compiler usage

mesonbuild/backend/ninjabackend.py

@@ -240,8 +240,7 @@ int dummy;
             self.generate_cs_target(target, outfile)
             return
         if 'vala' in self.environment.coredata.compilers.keys() and self.has_vala(target):
-            vc = self.environment.coredata.compilers['vala']
-            vala_output_files = self.generate_vala_compile(vc, target, outfile)
+            vala_output_files = self.generate_vala_compile(target, outfile)
             gen_src_deps += vala_output_files
         if 'swift' in self.environment.coredata.compilers.keys() and self.has_swift(target):
             self.generate_swift_target(target, outfile)
@@ -845,7 +844,7 @@ int dummy;
                     break
         return result
 
-    def generate_vala_compile(self, compiler, target, outfile):
+    def generate_vala_compile(self, target, outfile):
         """Vala is compiled into C. Set up all necessary build steps here."""
         valac = self.environment.coredata.compilers['vala']
         (src, vapi_src) = self.split_vala_sources(target.get_sources())
@@ -866,8 +865,8 @@ int dummy;
         generated_c_files = []
         outputs = [vapiname]
         args = []
-        args += self.build.get_global_args(compiler)
-        args += compiler.get_buildtype_args(self.environment.coredata.get_builtin_option('buildtype'))
+        args += self.build.get_global_args(valac)
+        args += valac.get_buildtype_args(self.environment.coredata.get_builtin_option('buildtype'))
         args += ['-d', self.get_target_private_dir(target)]
         args += ['-C']#, '-o', cname]
         if not isinstance(target, build.Executable):