Changed to skip the ZLib check when ZLIB_SOURCE is set.
Changed to skip the ZLib check when ZLIB_SOURCE is set.

MaxLeb/taglib,davispuh/taglib,taglib/taglib,taglib/taglib,i80and/taglib,pbhd/taglib,black78/taglib,videolabs/taglib,TsudaKageyu/taglib,i80and/taglib,pbhd/taglib,MaxLeb/taglib,Distrotech/taglib,Distrotech/taglib,Distrotech/taglib,black78/taglib,TsudaKageyu/taglib,videolabs/taglib,dlz1123/taglib,TsudaKageyu/taglib,dlz1123/taglib,MaxLeb/taglib,davispuh/taglib,davispuh/taglib,pbhd/taglib,i80and/taglib,videolabs/taglib,taglib/taglib,black78/taglib,dlz1123/taglib