Use zconf.h instead of zconf.h.in for cmake.

CMakeLists.txt

@@ -52,12 +52,12 @@ set(CPACK_INCLUDED TRUE)
 if(NOT ZLIB_CONF_WRITTEN)
     set(Z_PREFIX ${ZLIB_PREFIX})
     set(CONF_OUT_FILE ${zlib_BINARY_DIR}/zconf.h.cmakein)
-    file(READ ${zlib_SOURCE_DIR}/zconf.h.in ZCONF_CONTENT LIMIT 245)
+    file(READ ${zlib_SOURCE_DIR}/zconf.h ZCONF_CONTENT LIMIT 245)
     file(WRITE ${CONF_OUT_FILE} ${ZCONF_CONTENT})
     file(APPEND ${CONF_OUT_FILE} "#cmakedefine Z_PREFIX 1\n")
     file(APPEND ${CONF_OUT_FILE} "#cmakedefine HAVE_STDARG_H 1\n")
     file(APPEND ${CONF_OUT_FILE} "#cmakedefine HAVE_UNISTD_H 1\n")
-    file(READ ${zlib_SOURCE_DIR}/zconf.h.in ZCONF_CONTENT OFFSET 244)
+    file(READ ${zlib_SOURCE_DIR}/zconf.h ZCONF_CONTENT OFFSET 244)
     set(FIRST_ITEM TRUE)
 
     foreach(item IN LISTS ZCONF_CONTENT)