Stop passing -dl when trying to detect SQLite3's presence.

If we don't, the configuration tests will fail and SQLite3 support will always
be disabled.
--- configure.orig	2015-08-31 12:55:11 UTC
+++ configure
@@ -16834,7 +16834,7 @@ for ac_lib in '' sqlite3; do
     ac_res="none required"
   else
     ac_res=-l$ac_lib
-    LIBS="-l$ac_lib -ldl $ac_func_search_save_LIBS"
+    LIBS="-l$ac_lib $ac_func_search_save_LIBS"
   fi
   if ac_fn_c_try_link "$LINENO"; then :
   ac_cv_search_sqlite3_open=$ac_res
@@ -16900,7 +16900,7 @@ for ac_lib in '' sqlite3; do
     ac_res="none required"
   else
     ac_res=-l$ac_lib
-    LIBS="-l$ac_lib -ldl $ac_func_search_save_LIBS"
+    LIBS="-l$ac_lib $ac_func_search_save_LIBS"
   fi
   if ac_fn_c_try_link "$LINENO"; then :
   ac_cv_search_sqlite3_open=$ac_res
@@ -17031,7 +17031,7 @@ for ac_lib in '' sqlite3; do
     ac_res="none required"
   else
     ac_res=-l$ac_lib
-    LIBS="-l$ac_lib -ldl $ac_func_search_save_LIBS"
+    LIBS="-l$ac_lib $ac_func_search_save_LIBS"
   fi
   if ac_fn_c_try_link "$LINENO"; then :
   ac_cv_search_sqlite3_soft_heap_limit=$ac_res
@@ -17089,7 +17089,7 @@ for ac_lib in '' sqlite3; do
     ac_res="none required"
   else
     ac_res=-l$ac_lib
-    LIBS="-l$ac_lib -ldl $ac_func_search_save_LIBS"
+    LIBS="-l$ac_lib $ac_func_search_save_LIBS"
   fi
   if ac_fn_c_try_link "$LINENO"; then :
   ac_cv_search_sqlite3_soft_heap_limit64=$ac_res
@@ -17147,7 +17147,7 @@ for ac_lib in '' sqlite3; do
     ac_res="none required"
   else
     ac_res=-l$ac_lib
-    LIBS="-l$ac_lib -ldl $ac_func_search_save_LIBS"
+    LIBS="-l$ac_lib $ac_func_search_save_LIBS"
   fi
   if ac_fn_c_try_link "$LINENO"; then :
   ac_cv_search_sqlite3_errstr=$ac_res