Change 'ensure-directories-exist' to look for 'mkdir' in $PATH, not in /bin.

--- maxima-5.36.1/lisp-utils/defsystem.lisp.orig	2014-11-22 16:21:30.000000000 -0500
+++ maxima-5.36.1/lisp-utils/defsystem.lisp	2015-05-25 21:53:31.223648483 -0400
@@ -4627,7 +4627,7 @@
         (cmd (if (member :win32 *features*)
                  (format nil "mkdir \"~a\""
                          (coerce (subst #\\ #\/ (coerce (namestring dir) 'list)) 'string))
-                 (format nil "/bin/mkdir -p ~S" (namestring dir)))))
+                 (format nil "mkdir -p ~S" (namestring dir)))))
    (unless (directory dir)
      (lisp:system cmd))
    ;; The second return value is supposed to be T if directories were
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<tr><td><span title='2020-10-05 10:41:59 +0200'>2020-10-05</span></td><td><a href='/guix/commit/tests/guix-environment-container.sh?id=b68d4106518abed20ba308831b65dcc69bf120a5'>environment: Turn "lo" up in network-less containers.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2020-10-02 23:28:09 +0200'>2020-10-02</span></td><td><a href='/guix/commit/tests/guix-environment-container.sh?id=0f53c801b91919380a924b402d1ff822bb1dc6ea'>environment: Provide /etc/hosts in containers without '--network'.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2020-09-21 23:05:38 +0200'>2020-09-21</span></td><td><a href='/guix/commit/tests/guix-environment-container.sh?id=9b65281de51bcb56714509524f5ae0731c9b96d0'>environment: '--link-profile' uses ~/.guix-profile for environment variables.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2020-06-20 13:18:11 +0200'>2020-06-20</span></td><td><a href='/guix/commit/tests/guix-environment-container.sh?id=90f496be9ad53802fd260cac3840e7bae24a3e39'>tests: Actually run 'tests/guix-environment-container.sh'.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-10-03 23:48:59 +0200'>2019-10-03</span></td><td><a href='/guix/commit/tests/guix-environment-container.sh?id=5a02f8e3842c19d28f39e5b47d804ef70e1b3160'>environment: '--container' honors '--preserve'.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-08-17 16:23:05 +0200'>2019-08-17</span></td><td><a href='/guix/commit/tests/guix-environment-container.sh?id=75a6f66815db811cc41aadbe93033a6efd3ad62f'>tests: Move 'guix environment -C --no-cwd' test where it belongs.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-04-02 18:15:37 +0200'>2019-04-02</span></td><td><a href='/guix/commit/tests/guix-environment-container.sh?id=1ccc0f807d3f22fa9ade1c607c112e04df833a72'>environment: '-C' creates namespaces where the user is not root.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-03-26 18:11:52 +0100'>2019-03-26</span></td><td><a href='/guix/commit/tests/guix-environment-container.sh?id=952afb6f8c209692e52f9561965ee39e143e1d88'>environment: Create /etc/group in containers.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-03-26 18:11:52 +0100'>2019-03-26</span></td><td><a href='/guix/commit/tests/guix-environment-container.sh?id=8a9922bdee875b3b5e1d928fc8e2121ffa99663a'>environment: Use (gnu build accounts) for /etc/passwd handling.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>