Add ext-snappy and snappy support on Windows

config/pkg/ext/ext-snappy.yml

@@ -16,3 +16,4 @@ ext-snappy:
   lang: cpp
   php-extension:
     arg-type@unix: '--enable-snappy --with-snappy-includedir=@build_root_path@'
+    arg-type@windows: '--enable-snappy'

config/pkg/lib/snappy.yml

@@ -15,6 +15,13 @@ snappy:
     - snappy-c.h
     - snappy-sinksource.h
     - snappy-stubs-public.h
+  headers@windows:
+    - snappy.h
+    - snappy-c.h
+    - snappy-sinksource.h
+    - snappy-stubs-public.h
   lang: cpp
   static-libs@unix:
     - libsnappy.a
+  static-libs@windows:
+    - snappy.lib