Revert "Pull zlib from custom fork (#650)"

This reverts commit abe5d02.

Author: GeckoEidechse

primedev/cmake/Findminizip.cmake

@@ -1,9 +1,4 @@
 if(NOT minizip_FOUND)
-
-    # zlib 1.3.1 had a cmake change that broke stuff, so this branch on our fork reverts that one commit :)
-    set(ZLIB_TAG "fix-things")
-    set(ZLIB_REPOSITORY "https://github.com/R2Northstar/zlib")
-
     check_init_submodule(${PROJECT_SOURCE_DIR}/primedev/thirdparty/minizip)
 
     set(MZ_ZLIB