Install ninja

Author: radarhere

.appveyor.yml

@@ -14,10 +14,6 @@ on:
 permissions:
   contents: read
 
-concurrency:
-  group: ${{ github.workflow }}-${{ github.ref }}
-  cancel-in-progress: true
-
 jobs:
   build:
     runs-on: windows-latest
@@ -59,6 +55,7 @@ jobs:
             libxcb-devel
             libxcb-xinerama0
             make
+            ninja
             netpbm
             perl
             python3${{ matrix.python-minor-version }}-cffi