Fix some problems found by kent.

-lm is sometimes not linked, which causes errors about undefined rint()
- FreeBSD embedded library does not link with the flags returned by mysql_config
 (added -lcrypt to LIBS, whereby causing overlinking in case of normal non-embedded client)

configure.cmake

@@ -284,6 +284,9 @@ IF(UNIX)
   IF(NOT LIBM)
     MY_SEARCH_LIBS(__infinity m LIBM)
   ENDIF()
+  IF(NOT LIBM)
+    MY_SEARCH_LIBS(rint m LIBM)
+  ENDIF()
   MY_SEARCH_LIBS(gethostbyname_r  "nsl_r;nsl" LIBNSL)
   MY_SEARCH_LIBS(bind "bind;socket" LIBBIND)
   MY_SEARCH_LIBS(crypt crypt LIBCRYPT)

scripts/CMakeLists.txt

@@ -216,6 +216,10 @@ ENDIF()
 
 SET(LIBS "${CLIENT_LIBS}")
 
+IF(LIBCRYPT)
+  SET(LIBS "${LIBS} -l${LIBCRYPT}")
+ENDIF()
+
 IF(MSVC)
   STRING(REPLACE "-l" "" CLIENT_LIBS "${CLIENT_LIBS}")
   STRING(REPLACE "-l" "" LIBS "${LIBS}" )