Build Breakage

[Denis Kenzior]

The latest gisi changes break the build:

pep.c: In function ‘g_isi_pep_create’:
pep.c:80: error: ‘SOCK_NONBLOCK’ undeclared (first use in this function)
pep.c:80: error: (Each undeclared identifier is reported only once
pep.c:80: error: for each function it appears in.)
pep.c:80: error: ‘SOCK_CLOEXEC’ undeclared (first use in this function)
make[2]: *** [pep.lo] Error 1
make[1]: *** [all-recursive] Error 1

SOCK_NONBLOCK and SOCK_CLOEXEC are only available on kernel >= 2.6.28 & glibc 
>= 2.9.  I know this is hardly bleeding edge, but oFono should continue 
working with older systems.  Perhaps a --disable-isi configure option is 
_really_ in order?

Regards,
-Denis