[patch #8950] Fix AX_CXX_COMPILE_STDCXX for "noext" mode

Follow-up Comment #2, patch #8950 (project autoconf-archive):

I may have spoken too soon:

...
configure:9924: checking cfenv usability
configure:9924: g++ -std=c++14 -c -g3 -mfpmath=sse -msse -msse2  conftest.cpp
>&5
configure:9924: $? = 0
configure:9924: result: yes
configure:9924: checking cfenv presence
configure:9924: g++ -E  conftest.cpp
In file included from /usr/include/c++/5/cfenv:35:0,
                 from conftest.cpp:32:
/usr/include/c++/5/bits/c++0x_warning.h:32:2: error: #error This file requires
compiler and library support for the ISO C++ 2011 standard. This support is
currently experimental, and must be enabled with the -std=c++11 or
-std=gnu++11 compiler options.
 #error This file requires compiler and library support for the 
  ^
configure:9924: $? = 1
configure: failed program was:
| /* confdefs.h */
...
| /* end confdefs.h.  */
| #include <cfenv>
configure:9924: result: no
configure:9924: WARNING: cfenv: accepted by the compiler, rejected by the
preprocessor!
configure:9924: WARNING: cfenv: proceeding with the compiler's result
...

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