[SERVER-13762] Configure check for library rt is not done under Ubuntu C++11 build - MongoDB

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Under C++11 Ubuntu, the "Checking for library rt..." configuration test does not happen because the preceding check for clock_gettime fails

[2014/04/27 16:51:51.976] Checking if C++ compiler supports -std=c++0x...

 [2014/04/27 16:51:52.011] yes

 [2014/04/27 16:51:52.016] Checking if C compiler supports -std=c99...

 [2014/04/27 16:51:52.051] yes

 [2014/04/27 16:51:52.056] Checking if C compiler supports -fno-builtin-memcmp...

 [2014/04/27 16:51:52.091] yes

 [2014/04/27 16:51:52.093] Checking for __thread...

 [2014/04/27 16:51:52.204] yes

 [2014/04/27 16:51:52.206] Checking for C header file unistd.h...

 [2014/04/27 16:51:52.247] yes

 [2014/04/27 16:51:52.247] Checking whether clock_gettime is declared...

 [2014/04/27 16:51:52.285] no

Under the non-C++11 Enterprise Ubuntu build, the configuration checks passes for both the clock_gettime and the librt test that follows.

[2014/04/27 16:51:52.630] Checking if C++ compiler supports -std=c++0x...

 [2014/04/27 16:51:52.667] yes

 [2014/04/27 16:51:52.669] Checking if __cplusplus >= 201103L to auto-enable C++11...

 [2014/04/27 16:51:52.707] no

 [2014/04/27 16:51:52.712] Checking if C compiler supports -fno-builtin-memcmp...

 [2014/04/27 16:51:52.749] yes

 [2014/04/27 16:51:52.751] Checking for __thread...

 [2014/04/27 16:51:52.867] yes

 [2014/04/27 16:51:52.870] Checking for C header file unistd.h...

 [2014/04/27 16:51:52.913] yes

 [2014/04/27 16:51:52.914] Checking whether clock_gettime is declared...

 [2014/04/27 16:51:52.958] yes

 [2014/04/27 16:51:52.958] Checking for C library rt...

 [2014/04/27 16:51:53.063] yes

related to

SERVER-13686 support V8 3.25 JavaScript scripting engine

SERVER-13792 add SCons configure and runtime checks for POSIX monotonic clock