rpms: add chg

I'm not sure if there's a reason chg is not added by default.
If not, I would like to propose adding in this patch.

Differential Revision: https://phab.mercurial-scm.org/D220

contrib/mercurial.spec

@@ -83,6 +83,7 b' export PYTHONPATH=$PWD/%{docutilsname}'
 %endif
 
 make all
+make -C contrib/chg
 
 %install
 rm -rf $RPM_BUILD_ROOT
@@ -111,6 +112,7 b' make install DESTDIR=$RPM_BUILD_ROOT PRE'
 
 %endif
 
+install -m 755 contrib/chg/chg $RPM_BUILD_ROOT%{_bindir}/
 install -m 755 contrib/hgk $RPM_BUILD_ROOT%{_bindir}/
 install -m 755 contrib/hg-ssh $RPM_BUILD_ROOT%{_bindir}/
 
@@ -143,6 +145,7 b' rm -rf $RPM_BUILD_ROOT'
 %{_datadir}/emacs/site-lisp/mercurial.el
 %{_datadir}/emacs/site-lisp/mq.el
 %{_bindir}/hg
+%{_bindir}/chg
 %{_bindir}/hgk
 %{_bindir}/hg-ssh
 %dir %{_sysconfdir}/bash_completion.d/