Add packagegroup-core-buildessential

[Not heavily tested, but sent for discussion]

task-core-sdk is too big - for example, I simply don't want to ship tcl, ever =)
Historically distcc caused a large dependency graph explosion because it has
a utility which uses gtk+, although that was fixed.

packagegroup-core-sdk also includes coreutils, which is a bit
confusing; conceptually things dependent on coreutils should pull it
in explicitly, or possibly we just declare coreutils to be in the
minimal build set.

So packagegroup-core-buildessential is intended to be similar to
Debian's "build-essential" package.  It's the stuff needed by say 80+%
of components, not worth repeating over and over.

(From OE-Core rev: 7d6cc169c95fecf6388a275281eb8b8f5d8eb4a2)

Signed-off-by: Colin Walters <walters@verbum.org>
Signed-off-by: Saul Wold <sgw@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-core/packagegroups/packagegroup-core-buildessential.bb

@@ -0,0 +1,30 @@
+#
+# Copyright (C) 2007 OpenedHand Ltd.
+# Copyright (C) 2012 Red Hat, Inc.
+#
+
+SUMMARY = "Essential build dependencies"
+LICENSE = "MIT"
+PR = "r0"
+
+inherit packagegroup
+
+RDEPENDS_packagegroup-core-buildessential = "\
+    autoconf \
+    automake \
+    binutils \
+    binutils-symlinks \
+    cpp \
+    cpp-symlinks \
+    gcc \
+    gcc-symlinks \
+    g++ \
+    g++-symlinks \
+    gettext \
+    make \
+    libstdc++ \
+    libstdc++-dev \
+    libtool \
+    pkgconfig \
+    "
+

meta/recipes-core/packagegroups/packagegroup-core-sdk.bb

@@ -16,28 +16,13 @@ RREPLACES_packagegroup-core-sdk = "task-core-sdk"
 RCONFLICTS_packagegroup-core-sdk = "task-core-sdk"
 
 RDEPENDS_packagegroup-core-sdk = "\
-    autoconf \
-    automake \
-    binutils \
-    binutils-symlinks \
+    packagegroup-core-buildessential \
     coreutils \
-    cpp \
-    cpp-symlinks \
     ccache \
     diffutils \
-    gcc \
-    gcc-symlinks \
-    g++ \
-    g++-symlinks \
-    gettext \
-    make \
     intltool \
-    libstdc++ \
-    libstdc++-dev \
-    libtool \
     perl-module-re \
     perl-module-text-wrap \
-    pkgconfig \
     findutils \
     quilt \
     less \