bitbake.conf, sanity.bbclass: Drop mercurial-native

We have no hg URIs in the metadata, so don't require and don't
ASSUME_PROVIDED it either.  meta-oe has a mercurial-native recipe
if hg URIs are added in a recipe later.

(From OE-Core rev: 6473c9096bf4995c21147e737322d800219c89ab)

Signed-off-by: Tom Rini <tom_rini@mentor.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/classes/sanity.bbclass

@@ -209,7 +209,7 @@ def check_sanity(e):
     if not check_app_exists('${BUILD_PREFIX}g++', e.data):
         missing = missing + "C++ Compiler (%sg++)," % data.getVar("BUILD_PREFIX", e.data, True)
 
-    required_utilities = "patch help2man diffstat texi2html makeinfo cvs svn bzip2 tar gzip gawk hg chrpath wget cpio"
+    required_utilities = "patch help2man diffstat texi2html makeinfo cvs svn bzip2 tar gzip gawk chrpath wget cpio"
 
     if "qemu-native" in assume_provided:
         if not check_app_exists("qemu-arm", e.data):

meta/conf/bitbake.conf

@@ -132,7 +132,6 @@ ASSUME_PROVIDED = "\
     cvs-native \
     grep-native \
     diffstat-native \
-    mercurial-native \
     patch-native \
     perl-native-runtime \
     python-native-runtime \