[packages/ruby-msgpack] update BR

[glen]

commit 5e89b86395817312150ea901c9e253f8d2aaef6d
Author: Elan Ruusamäe <glen at delfi.ee>
Date:   Sun Sep 18 21:40:15 2016 +0300

    update BR
    
    /usr/bin/ld: cannot find -lgmp
    extconf.rb:1:in `require': cannot load such file -- mkmf (LoadError)

 ruby-msgpack.spec | 2 ++
 1 file changed, 2 insertions(+)
---
diff --git a/ruby-msgpack.spec b/ruby-msgpack.spec
index 634135d..279a9b8 100644
--- a/ruby-msgpack.spec
+++ b/ruby-msgpack.spec
@@ -12,8 +12,10 @@ Group:		Development/Languages
 Source0:	https://rubygems.org/gems/%{pkgname}-%{version}.gem
 # Source0-md5:	7289b86b6fabf77809d89721a515688a
 URL:		https://msgpack.org/
+BuildRequires:	gmp-devel
 BuildRequires:	rpm-rubyprov
 BuildRequires:	rpmbuild(macros) >= 1.665
+BuildRequires:	ruby-devel
 BuildRoot:	%{tmpdir}/%{name}-%{version}-root-%(id -u -n)
 
 %description
================================================================

---- gitweb:

http://git.pld-linux.org/gitweb.cgi/packages/ruby-msgpack.git/commitdiff/5e89b86395817312150ea901c9e253f8d2aaef6d