opkg 0.1.8: do_fetch failed since no checksum specified

* We use meta/recipes-devtools/opkg/opkg_svn.bb by default, the
  opkg_0.1.8.bb failed since no checksum specified.

* The add_vercmp.patch in both opkg/ and opkg-0.1.8/, remove the one
  in opkg-0.1.8/

This patch doesn't impact the output, so I think that we don't have to
increment the PR.

[YOCTO #2498]

(From OE-Core rev: 316fac638646a50149f36ec4687b5a2a6d2e83b1)

Signed-off-by: Robert Yang <liezhi.yang@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-devtools/opkg/opkg-0.1.8/add_vercmp.patch

@@ -1,36 +0,0 @@
-Upstream-Status: Inappropriate [other]
-
-Index: trunk/libopkg/opkg.c
-===================================================================
---- trunk.orig/libopkg/opkg.c	2010-01-26 20:32:19.000000000 +0000
-+++ trunk/libopkg/opkg.c	2010-01-26 20:40:34.000000000 +0000
-@@ -876,3 +876,18 @@
- 
- 	return ret;
- }
-+
-+int
-+opkg_compare_versions (const char *ver1, const char *ver2)
-+{
-+  pkg_t *pkg1, *pkg2;
-+
-+  pkg1 = pkg_new();
-+  pkg2 = pkg_new();
-+
-+  parse_version(pkg1, ver1);
-+  parse_version(pkg2, ver2);
-+
-+  return pkg_compare_versions(pkg1, pkg2);
-+}
-+
-Index: trunk/libopkg/opkg.h
-===================================================================
---- trunk.orig/libopkg/opkg.h	2010-01-26 20:32:19.000000000 +0000
-+++ trunk/libopkg/opkg.h	2010-01-26 20:35:19.000000000 +0000
-@@ -58,4 +58,6 @@
- 
- int opkg_repository_accessibility_check(void);
- 
-+int opkg_compare_versions (const char *ver1, const char *ver2);
-+
- #endif /* OPKG_H */

meta/recipes-devtools/opkg/opkg_0.1.8.bb

@@ -5,4 +5,7 @@ SRC_URI = "http://opkg.googlecode.com/files/opkg-${PV}.tar.gz \
            file://headerfix.patch \
           "
 
+SRC_URI[md5sum] = "c714ce0e4863bf1315e3b6913ffe3299"
+SRC_URI[sha256sum] = "ff94bf30bd662d49c4b5057e3a0818d062731adaa555d59abd677ec32a3c1c60"
+
 PR = "${INC_PR}.0"