Make fails

[Alex Aycinena]

Make fails on Fedora 22 on the latest master with the following error:

/home/gnucash-dev/gitcheckouts/gnucash-clean/src/backend/xml/gnc-backend-xml.cpp:
In function 'gboolean gnc_xml_be_get_file_lock(FileBackend*)':
/home/gnucash-dev/gitcheckouts/gnucash-clean/src/backend/xml/gnc-backend-xml.cpp:175:13:
error: comparison between signed and unsigned integer expressions
[-Werror=sign-compare]
             >= pathbuf_size - (path - pathbuf))
             ^
At global scope:
cc1plus: error: unrecognized command line option "-Wno-deprecated-register"
[-Werror]
cc1plus: all warnings being treated as errors
Makefile:817: recipe for target 'gnc-backend-xml.lo' failed
make[5]: *** [gnc-backend-xml.lo] Error 1
make[5]: Leaving directory
'/home/gnucash-dev/gitcheckouts/gnucash-clean-build/src/backend/xml'

Regards,

Alex