build.sh cannot compile libhash (because of dependence on libstrex)

[szsam]

 [build-stdout] ==== build linux libhash start...
 [build-stderr] /usr/bin/ld: cannot find -lstrex
 [build-stderr] collect2: error: ld returned 1 exit status
 [build-stderr] make: *** [Makefile:91: test_libhash] Error 1

It seems that libhash depends on libstrex but libstrex is not compiled yet. The library list here should take care of the dependency: https://github.com/gozfree/gear-lib/blob/e646926b4e30b14d45bc02189caedb8d01b5d163/build.sh#L28-L30