Update boost.m4 to fix building with GCC 5

The old version of boost.m4 included in flamerobin had an issue with gcc5 (one of its tests fails due to the first change described in https://gcc.gnu.org/gcc-5/porting_to.html , "Preprocessor issues"). This was fixed upstream in Nov 2014:

https://github.com/tsuna/boost.m4/commit/32553aaf4d5090da19aa0ec33b936982c685009f

flamerobin's boost.m4 is now updated (and the autotools stuff re-run so aclocal.m4 and configure get the change).

Using of deprecated isc_interprete()

isc_interprete() is now replaced with fb_interpret() in flamerobin.

Thanks to this patch compiling flamerobin is clean of deprecated firebird api warnings (g++ ubuntu 14.04)