ceph.spec.in: add missing BuildRequires from SUSE block

The %endif removed by f94f23297c05019db754ec53b4ceaea7706152c9 is restored.
The %else removed by 75e87a20dac05441b97ce99dea76fff8e3a863ac is restored.
The stray %endif added by d8abde3338 is removed.

May 29th, in d8abde3338 Owen added a stray
%endif after

   BuildRequires: gperftools-devel

around line 133. June 3rd, in f94f23297c05019db754ec53b4ceaea7706152c9
Ken correctly attributed the error

     "error: /srv/autobuild-ceph/gitbuilder.git/build/ceph.spec:140: Got a
      %endif with no %if"

to a stray %endif but did not remove the one causing problem and in
doing so created another problem. June 4th, in
75e87a20dac05441b97ce99dea76fff8e3a863ac Owen incorrectly fixed
this new problem by removing the %else that is near

   BuildRequires: gperftools-devel

around line 116, instead of reverting
f94f23297c05019db754ec53b4ceaea7706152c9. As a consequence the
ceph.spec.in became syntactically correct but implemented an if/else
logic different from what was intended originally and a number of
BuildRequires became exclusive to SUSE and were not installed for CentOS
7 etc.

http://tracker.ceph.com/issues/11901 Fixes: #11901

Signed-off-by: Loic Dachary <ldachary@redhat.com>

ceph.spec.in

@@ -116,8 +116,10 @@ Requires:	gptfdisk
 %if 0%{with tcmalloc}
 BuildRequires:	gperftools-devel
 %endif
+%else
 Requires:	scsirastools
 BuildRequires:	google-perftools-devel
+%endif
 Recommends:	logrotate
 BuildRequires:	%insserv_prereq
 BuildRequires:	mozilla-nss-devel
@@ -135,7 +137,6 @@ Requires(preun):	chkconfig
 Requires(preun):	initscripts
 BuildRequires:	gperftools-devel
 %endif
-%endif
 
 %description
 Ceph is a massively scalable, open-source, distributed