CMake: Remove unused variable.

Author: Vollstrecker

CMakeLists.txt

@@ -168,7 +168,6 @@ endif(WIN32)
 if(ZLIB_BUILD_SHARED)
     add_library(zlib SHARED
         ${ZLIB_SRCS}
-        ${ZLIB_DLL_SRCS}
         ${ZLIB_PUBLIC_HDRS}
         ${ZLIB_PRIVATE_HDRS}
         $<$<OR:$<BOOL:${WIN32}>,$<BOOL:${CYGWIN}>>:win32/zlib1.rc>)