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='2021-11-14 17:32:51 -0800'>2021-11-14</span></td><td><a href='/guix/commit/gnu/home/services.scm?id=40a18f493409b9917964a6e2476382cca4856c7d'>home: services: Typo fix.</a><span class='msg-avail'>...</span></td><td>Vagrant Cascadian</td></tr>
<tr><td><span title='2021-11-14 23:18:08 +0100'>2021-11-14</span></td><td><a href='/guix/commit/gnu/home/services.scm?id=4dcec60fa6a93dbc93bef2cdb91e3633c705579e'>home-services: Demonadify 'on-first-login' handling.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2021-11-14 23:18:08 +0100'>2021-11-14</span></td><td><a href='/guix/commit/gnu/home/services.scm?id=5c2f30d3de6507d868a1f38563170f6e49a7bb44'>home-services: on-first-login: Check if XDG_RUNTIME_DIR exists.</a><span class='msg-avail'>...</span></td><td>Andrew Tropin</td></tr>
<tr><td><span title='2021-10-09 19:24:19 +0300'>2021-10-09</span></td><td><a href='/guix/commit/gnu/home/services.scm?id=0f6a27c2c46ab6603a6b1ed9cee99c9f81eca3c5'>scripts: home: Make sure profile directory exists.</a><span class='msg-avail'>...</span></td><td>Oleg Pykhalov</td></tr>
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