ruby: add detection of Ruby 2.1

ChangeLog.asciidoc

@@ -84,6 +84,7 @@ http://weechat.org/files/releasenotes/ReleaseNotes-devel.html[release notes]
 * relay: fix freeze after /upgrade when many disconnected clients still exist
 * relay: fix NULL pointer when reading buffer lines for irc backlog
 * rmodifier: remove plugin (replaced by trigger)
+* ruby: add detection of Ruby 2.1
 * script: fix scroll on script buffer in the detailed view of script
   (closes #6)
 * scripts: fix crash when a signal is received with type "int" and NULL pointer

cmake/FindRuby.cmake

@@ -33,7 +33,7 @@ ENDIF(RUBY_FOUND)
 
 FIND_PACKAGE(PkgConfig)
 IF(PKG_CONFIG_FOUND)
-  pkg_search_module(RUBY ruby-2.0 ruby-1.9 ruby-1.8)
+  pkg_search_module(RUBY ruby-2.1 ruby-2.0 ruby-1.9 ruby-1.8)
 ENDIF(PKG_CONFIG_FOUND)
 
 IF(RUBY_FOUND)

configure.ac

@@ -561,7 +561,7 @@ RUBY_VERSION=
 if test "x$enable_ruby" = "xyes" ; then
     RUBY_CFLAGS=""
     RUBY_LFLAGS=""
-    for v in "2.0" "1.9" "1.8" ; do
+    for v in "2.1" "2.0" "1.9" "1.8" ; do
         pkgconfig_ruby_found=`$PKGCONFIG --exists ruby-$v 2>/dev/null`
         if test "x$?" = "x0" ; then
             RUBY_VERSION=`$PKGCONFIG --modversion ruby-$v`