build-tools: add GNU sed required by gettext-tools on OS X

recipes/build-tools/gettext-tools.recipe

@@ -9,7 +9,7 @@ class Recipe(recipe.Recipe):
     stype = SourceType.TARBALL
     tarball_dirname = 'gettext-%(version)s'
     url = 'http://ftp.gnu.org/pub/gnu/gettext/gettext-0.18.2.tar.gz'
-    platform_deps = {Platform.DARWIN:  ['libiconv']}
+    platform_deps = {Platform.DARWIN:  ['libiconv', 'sed']}
     configure_options = ' --disable-java --disable-csharp --disable-native-java --without-csv'
 
     def prepare(self):

recipes/build-tools/gnu-sed.recipe

+# -*- Mode: Python -*- vi:si:et:sw=4:sts=4:ts=4:syntax=python
+
+
+class Recipe(recipe.Recipe):
+    name = 'sed'
+    version = '4.2'
+    licenses = [License.GPLv2]
+    stype = SourceType.TARBALL
+    url = 'http://ftp.gnu.org/gnu/sed/sed-4.2.tar.gz'