lush-pthread: Fix the GCC version test to allow for major versions greater than 4.x.  (E.g., the test would have broken for version 5.0.)
lush-pthread: Fix the GCC version test to allow for major versions greater than 4.x.  (E.g., the test would have broken for version 5.0.)

zcth428/hpctoolkit,zcth428/hpctoolkit111,HPCToolkit/hpctoolkit,zcth428/hpctoolkit111,zcth428/hpctoolkit,HPCToolkit/hpctoolkit,zcth428/hpctoolkit,HPCToolkit/hpctoolkit,zcth428/hpctoolkit,HPCToolkit/hpctoolkit,zcth428/hpctoolkit111,zcth428/hpctoolkit111,zcth428/hpctoolkit,HPCToolkit/hpctoolkit,HPCToolkit/hpctoolkit,zcth428/hpctoolkit111