bash: security bump to patchlevel 25

Fixes CVE-2014-6271:

Under certain circumstances, bash will execute user code while
processing the environment for exported function definitions.

Also add hash file.

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/bash/bash.hash

@@ -0,0 +1,2 @@
+# Locally calculated after checking pgp signature
+sha256	afc687a28e0e24dc21b988fa159ff9dbcf6b7caa92ade8645cc6d5605cd024d4	bash-4.3.tar.gz