lib: miniz: only require a C compiler

Commit richgel999/miniz@05ab4dc
"Add some catch2 tests" dropped that C flag, but should instead only have added a simple
enable_language call for the tests only.

Upstream: richgel999/miniz@383e551
Signed-off-by: Thomas Devoogdt <thomas@devoogdt.com>

Author: ThomasDevoogdt

lib/miniz/CMakeLists.txt

@@ -7,7 +7,7 @@ if(DEFINED PROJECT_NAME)
 endif()
 
 if(CMAKE_MINOR_VERSION LESS 12)
-  project(miniz)
+  project(miniz C)
   # see issue https://gitlab.kitware.com/cmake/cmake/merge_requests/1799
 else()
   project(miniz C)