urxvt: add --disable-iso14755

There's an annoying hardcoded key combination (Ctrl+Shift) that starts ISO 14755
mode for i18n support. Given the ubiquity of UTF-8, this mode is largely useless
and can only be disabled with a command-line option. A simple search on google
shows how many people find this annoying:

http://www.google.com/search?q=disable+iso14755&oq=disable+iso14755

Signed-off-by: Adam Vandenberg <flangy@gmail.com>

Formula/rxvt-unicode.rb

@@ -14,16 +14,23 @@ class RxvtUnicode < Formula
     DATA
   end
 
-  def install
-    system "./configure", "--prefix=#{prefix}",
-                          "--mandir=#{man}",
-                          "--disable-afterimage",
-                          "--enable-perl",
-                          "--enable-256-color",
-                          "--with-term=rxvt-unicode-256color",
-                          "--with-terminfo=/usr/share/terminfo",
-                          "--enable-smart-resize"
+  def options
+    [["--disable-iso14755", "Disable ISO 14775 Shift+Ctrl hotkey"]]
+  end
 
+  def install
+    args = ["--prefix=#{prefix}",
+            "--mandir=#{man}",
+            "--disable-afterimage",
+            "--enable-perl",
+            "--enable-256-color",
+            "--with-term=rxvt-unicode-256color",
+            "--with-terminfo=/usr/share/terminfo",
+            "--enable-smart-resize"]
+    
+    args << "--disable-iso14755" if ARGV.include? "--disable-iso14755"
+
+    system "./configure", *args
     system "make"
     # `make` won't work unless we rename this because of HFS's default case-insensitivity
     system "mv INSTALL README.install"