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build: fix compiler version detection

Rodrigo Muino Tomonari requested to merge github/fork/richardlau/fix_compiler_detection into master

Compiler version tuples should be numeric for tuple comparisons to work.

Before:

-bash-4.2$ gcc --version
gcc (GCC) 4.8.5 20150623 (Red Hat 4.8.5-28)
Copyright (C) 2015 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

-bash-4.2$ ./configure
-bash-4.2$

After:

-bash-4.2$ gcc --version
gcc (GCC) 4.8.5 20150623 (Red Hat 4.8.5-28)
Copyright (C) 2015 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

-bash-4.2$ ./configure
WARNING: C++ compiler too old, need g++ 4.9.4 or clang++ 3.4.2 (CXX=g++)
WARNING: warnings were emitted in the configure phase
-bash-4.2$
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