Avoid usage of PATH_MAX.

Taken from https://salsa.debian.org/freedesktop-team/fontconfig/-/blob/master/debian/patches/path_max.patch

Index: fontconfig-2.13.1/src/fccfg.c
===================================================================
--- fontconfig-2.13.1.orig/src/fccfg.c
+++ fontconfig-2.13.1/src/fccfg.c
@@ -2231,7 +2231,7 @@ FcConfigRealFilename (FcConfig		*config,
 
     if (n)
     {
-	FcChar8 buf[PATH_MAX];
+	FcChar8 buf[FC_PATH_MAX];
 	ssize_t len;
 
 	if (sysroot)
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<div class='path'>path: <a href='/guix/log/?id=828ceee7db0ab74786049600108d6b15017851c5'>root</a>/<a href='/guix/log/po?id=828ceee7db0ab74786049600108d6b15017851c5'>po</a>/<a href='/guix/log/po/doc?id=828ceee7db0ab74786049600108d6b15017851c5'>doc</a>/<a href='/guix/log/po/doc/guix-cookbook.zh_Hans.po?id=828ceee7db0ab74786049600108d6b15017851c5'>guix-cookbook.zh_Hans.po</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/po/doc/guix-cookbook.zh_Hans.po?id=828ceee7db0ab<tr><td><span title='2020-05-08 16:30:50 +0200'>2020-05-08</span></td><td><a href='/guix/commit/gnu/services/dbus.scm?id=dd0804c67e99914eecc471fdb92f4220425a1cbc'>services: Add descriptions.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/services/dbus.scm (polkit-service-type)[description]: New field.
* gnu/services/dict.scm (dicod-service-type)[description]: New field.
* gnu/services/dns.scm (knot-service-type)[description]: New field.
* gnu/services/networking.scm (dhcpd-service-type)[description]: New field.
* gnu/services/shepherd.scm (shepherd-root-service-type)[description]:
New field.
* gnu/services/xorg.scm (slim-service-type)[description]: New field.
(screen-locker-service-type)[description]: New field.
* gnu/system/pam.scm (pam-root-service-type)[description]: New field.
* gnu/system/shadow.scm (account-service-type)[description]: New field.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-11-13 23:26:36 +0100'>2019-11-13</span></td><td><a href='/guix/commit/gnu/services/dbus.scm?id=1f8ca28b9e517f73d1a640dbbd11eadbf35b885b'>services: dbus: Simplify 'dbus-uuidgen' invocation.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/services/dbus.scm (dbus-activation): Use the "--ensure" option of
'dbus-uuidgen' instead of forking and redirecting ports.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-11-13 23:26:36 +0100'>2019-11-13</span></td><td><a href='/guix/commit/gnu/services/dbus.scm?id=7462a1de22636dde24d56225c67bb3c10118b698'>services: dbus: Log to syslog.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/services/dbus.scm (dbus-shepherd-service): Add 'syslogd' to
'requirement'.  Pass the "--syslog-only" command-line option.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-11-13 23:26:36 +0100'>2019-11-13</span></td><td><a href='/guix/commit/gnu/services/dbus.scm?id=a01d2e300abf8721866c8d1f984b0db90d192f9d'>services: dbus: Add description.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/services/dbus.scm (dbus-root-service-type)[description]: New
field.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-11-02 00:12:19 +0100'>2019-11-02</span></td><td><a href='/guix/commit/gnu/services/dbus.scm?id=27727b18b8597f7c6fd99adc7797c555aa1c92e9'>services: dbus: Remove non-existent directories from 'system-local.conf'.</a><span class='msg-avail'>...<span class='msg-tooltip'>This typically halves the number of entries in
/etc/dbus-1/system-local.conf.

* gnu/services/dbus.scm (dbus-configuration-directory)[build](directives):
New macro.
(services-&gt;sxml): Use it.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-11-02 00:12:19 +0100'>2019-11-02</span></td><td><a href='/guix/commit/gnu/services/dbus.scm?id=33f9778bc83086837b99e5c5e99cd514cb0d154e'>services: dbus: Include each service's "share/dbus-1/system.d".</a><span class='msg-avail'>...<span class='msg-tooltip'>Fixes &lt;https://bugs.gnu.org/37911&gt;.
Reported by Jack Hill &lt;jackhill@jackhill.us&gt;.

Sometime between 1.1.8 and 1.4.3, 'colord' moved had its
'org.freedesktop.ColorManager.conf' file moved from
"etc/dbus-1/system.d" to "share/dbus-1/system.d".  Adjust to this
change.

* gnu/services/dbus.scm (dbus-configuration-directory): Add an
'includedir' directive for DIR/share/dbus-1/system.d.
</span></span></td><td>Ludovic Courtès</td></tr>