ucode: also link libresolv if ns_initparse() is not found

Recent glibc versions require linking libresolv to obtain ns_initparse().

Fixes: #144
Signed-off-by: Jo-Philipp Wich <jo@mein.io>

CMakeLists.txt

@@ -171,8 +171,9 @@ IF(RESOLV_SUPPORT)
   SET_TARGET_PROPERTIES(resolv_lib PROPERTIES OUTPUT_NAME resolv PREFIX "")
   TARGET_LINK_OPTIONS(resolv_lib PRIVATE ${UCODE_MODULE_LINK_OPTIONS})
   CHECK_FUNCTION_EXISTS(res_mkquery RES_MKQUERY_FUNCTION_EXISTS)
+  CHECK_FUNCTION_EXISTS(ns_initparse NS_INITARSE_FUNCTION_EXISTS)
   CHECK_FUNCTION_EXISTS(clock_gettime CLOCK_GETTIME_FUNCTION_EXISTS)
-  IF (NOT RES_MKQUERY_FUNCTION_EXISTS)
+  IF (NOT RES_MKQUERY_FUNCTION_EXISTS OR NOT NS_INITARSE_FUNCTION_EXISTS)
     TARGET_LINK_LIBRARIES(resolv_lib resolv)
   ENDIF()
   IF (NOT CLOCK_GETTIME_FUNCTION_EXISTS)