gnu: linux: Add 'bash' input for 'wrap-program'.

It is required for cross-compilation.

* gnu/packages/linux.scm
(kbd)[inputs]: Add 'bash-minimal'.
(singularity)[inputs]: Likewise.

Signed-off-by: Maxim Cournoyer <maxim.cournoyer@gmail.com>
Modified-by: Maxim Cournoyer <maxim.cournoyer@gmail.com>
Change-Id: I5586d61c683f8f1f48f9d28590f088023572b2b8

gnu/packages/linux.scm

@@ -4236,7 +4236,8 @@ NUMA performance on your system.")
     (native-inputs
      (list autoconf pkg-config))
     (inputs
-     `(("bzip2" ,bzip2)
+     `(("bash" ,bash-minimal) ; for wrap-program
+       ("bzip2" ,bzip2)
        ("gzip" ,gzip)
        ("pam" ,linux-pam)
        ("xz" ,xz)
@@ -5383,7 +5384,8 @@ thanks to the use of namespaces.")
                    (string-append (which "env") " "
                                   #$output "/bin/singularity")))))))))
     (inputs
-     (list coreutils
+     (list bash-minimal
+           coreutils
            libarchive
            python-wrapper
            squashfs-tools