glibc: add version 2.21

- Add version 2.21
- Add a hash value for it

Signed-off-by: Vicente Olivert Riera <Vincent.Riera@imgtec.com>
Acked-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/glibc/Config.in

@@ -38,6 +38,9 @@ config BR2_GLIBC_VERSION_2_19
 config BR2_GLIBC_VERSION_2_20
 	bool "2.20"
 
+config BR2_GLIBC_VERSION_2_21
+	bool "2.21"
+
 endchoice
 
 endif

package/glibc/glibc.hash

@@ -6,3 +6,4 @@ md5	197836c2ba42fb146e971222647198dd	eglibc-2.19-svnr25243.tar.bz2
 sha1	8013c1935b46fd50d2d1fbfad3b0af362b75fb28	eglibc-2.19-svnr25243.tar.bz2
 sha256	2d3997f588401ea095a0b27227b1d50cdfdd416236f6567b564549d3b46ea2a2	glibc-2.19.tar.xz
 sha256	f84b6d42aecc288d593c397b0a3d02260a33ee686bce0c634eb9b32798f36ba5	glibc-2.20.tar.xz
+sha256  aeeb362437965a5d3f40b151094ca79def04a115bd363fdd4a9a0c69482923b8  glibc-2.21.tar.xz