CMake: Give minizip a suffix on Cygwin as well.

.github/workflows/msys-cygwin.yml

@@ -68,7 +68,8 @@ jobs:
         cmake /cygdrive/d/a/zlib/zlib \
           -B build \
           -DCMAKE_BUILD_TYPE=Release \
-          -DZLIB_BUILD_MINIZIP=OFF \
+          -DZLIB_BUILD_MINIZIP=ON \
+          -DMINIZIP_ENABLE_BZIP2=OFF \
           -G Ninja
     - name: Build
       run: cmake --build build --config Release -v -j1

contrib/minizip/CMakeLists.txt

@@ -114,10 +114,10 @@ set(MINIUNZIP_HDRS
     unzip.h
     zip.h)
 
-if(WIN32)
+if(WIN32 OR CYGWIN)
     set(minizip_static_suffix "s")
     set(CMAKE_DEBUG_POSTFIX "d")
-endif(WIN32)
+endif(WIN32 OR CYGWIN)
 
 if(MINIZIP_BUILD_SHARED)
     set(CMAKE_WINDOWS_EXPORT_ALL_SYMBOLS TRUE)