ruby: fix build with libffi 3.1

ruby/.md5sum

@@ -1 +1,2 @@
 ed9b8565bdeccb401d628ec8d54a0774  ruby-2.1.2.tar.bz2
+0fc7c8079e55abd9d1b23779852b441e  ruby-libffi_ver_string.patch

ruby/Pkgfile

@@ -5,12 +5,16 @@
 
 name=ruby
 version=2.1.2
-release=1
-source=(ftp://ftp.ruby-lang.org/pub/$name/2.1/$name-$version.tar.bz2)
+release=2
+source=(ftp://ftp.ruby-lang.org/pub/$name/2.1/$name-$version.tar.bz2
+        $name-libffi_ver_string.patch)
 
 build () {
     cd $name-$version
 
+    # fiddle requires a 3-digit version string form libffi
+    patch -p1 -i $SRC/$name-libffi_ver_string.patch
+
     ./configure --prefix=/usr \
                 --mandir=/usr/man \
                 --enable-shared \

ruby/ruby-libffi_ver_string.patch

@@ -0,0 +1,13 @@
+diff -Nru ruby-2.1.2.orig/ext/fiddle/extconf.rb ruby-2.1.2/ext/fiddle/extconf.rb
+--- ruby-2.1.2.orig/ext/fiddle/extconf.rb	2014-06-03 10:54:39.663000000 +0200
++++ ruby-2.1.2/ext/fiddle/extconf.rb	2014-06-03 10:56:49.318000000 +0200
+@@ -7,6 +7,9 @@
+ pkg_config("libffi")
+ if ver = pkg_config("libffi", "modversion")
+   ver = ver.gsub(/-rc\d+/, '') # If ver contains rc version, just ignored.
++  while ver.split('.').size < 3
++    ver = ver + ".0"
++  end
+   $defs.push(%{-DRUBY_LIBFFI_MODVERSION=#{ '%d%03d%03d' % ver.split('.') }})
+ end
+