Change RPM dependency from Prereq to Requires.

Sergey Vlasov says we do not pre-require (i.e. required packages
during installation) the dependencies, and should use Requires
instead of Prereq.  Knowing nothing about RPM, I just believe
him.
Signed-off-by: NJunio C Hamano <junkio@cox.net>

git-core.spec.in

@@ -10,7 +10,7 @@ URL: 		http://kernel.org/pub/software/scm/git/
 Source: 	http://kernel.org/pub/software/scm/git/%{name}-%{version}.tar.gz
 BuildRequires:	zlib-devel, openssl-devel, curl-devel  %{!?_without_docs:, xmlto, asciidoc > 6.0.3}
 BuildRoot:	%{_tmppath}/%{name}-%{version}-root
-Prereq: 	sh-utils, diffutils, rsync, rcs, mktemp >= 1.5
+Requires: 	sh-utils, diffutils, rsync, rcs, mktemp >= 1.5
 
 %description
 This is a stupid (but extremely fast) directory content manager.  It