sofia-sip: fail to build on riscv64

[vimer <tsu.yubo@gmail.com>]

Hi,
I apply patch[1] to sip source and pass for " machine `riscv64' not
recognized" error, but fail at last:

```
...
touch man/man1/sip-date.1 man/man1/sip-options.1 man/man1/localinfo.1 man/man1/addrinfo.1 man/man1/stunc.1 man/man1/sip-dig.1
  /bin/mkdir -p '/<<PKGBUILDDIR>>/debian/tmp/usr/share/man/man1'
    /usr/bin/install -c -m 644 man/man1/sip-date.1 man/man1/sip-options.1 man/man1/localinfo.1 man/man1/addrinfo.1 man/man1/stunc.1 man/man1/sip-dig.1 '/<<PKGBUILDDIR>>/debian/tmp/usr/share/man/man1'
make[3]: Leaving directory '/<<PKGBUILDDIR>>/objs'
make[2]: Leaving directory '/<<PKGBUILDDIR>>/objs'
make[1]: Leaving directory '/<<PKGBUILDDIR>>/objs'
touch install-arch-stamp
dh_testdir
dh_testroot
dh_install --sourcedir=debian/tmp
dh_install: warning: Cannot find (any matches for) "usr/lib/libsofia-sip-ua-glib.so.*" (tried in debian/tmp, debian/tmp)

dh_install: warning: libsofia-sip-ua-glib3 missing files: usr/lib/libsofia-sip-ua-glib.so.*
dh_install: warning: Cannot find (any matches for) "usr/lib/libsofia-sip-ua-glib.a" (tried in debian/tmp, debian/tmp)

dh_install: warning: libsofia-sip-ua-glib-dev missing files: usr/lib/libsofia-sip-ua-glib.a
dh_install: warning: Cannot find (any matches for) "usr/lib/libsofia-sip-ua-glib.so" (tried in debian/tmp, debian/tmp)

dh_install: warning: libsofia-sip-ua-glib-dev missing files: usr/lib/libsofia-sip-ua-glib.so
dh_install: warning: Cannot find (any matches for) "usr/lib/pkgconfig/sofia-sip-ua-glib.pc" (tried in debian/tmp, debian/tmp)

dh_install: warning: libsofia-sip-ua-glib-dev missing files: usr/lib/pkgconfig/sofia-sip-ua-glib.pc
dh_install: error: missing files, aborting
make: *** [debian/rules:87: binary-arch] Error 25
dpkg-buildpackage: error: fakeroot debian/rules binary-arch subprocess returned exit status 2
```

And i test `sbuild --host=armhf -d sid` in order to compare the build log, the error is same.
But `--host` is ok.
I try to fix it with many ways but can not find why it is not build or install
the missing file.
Maybe my chroot have some problem?

BR,
vimer

[1]: https://bugs.debian.org/cgi-bin/bugreport.cgi?att=1;bug=978498;filename=sofia-sip-retooling.patch;msg=10