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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<tr><td><span title='2023-07-23 02:00:00 +0200'>2023-07-23</span></td><td><a href='/guix/commit/gnu/packages/android.scm?id=789f7e9a3d37135d22d0a84c987fe3877131fd06'>gnu: fuse@3: Bind to default FUSE variable.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/linux.scm (fuse): Rename this…
(fuse-2): …to this, and…
(fuse-3): …rename this…
(fuse): …to this!
(fuse-static): Rename this…
(fuse-2-static): …to this.
Adjust all users.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2023-07-24 17:38:29 +0200'>2023-07-24</span></td><td><a href='/guix/commit/gnu/packages/android.scm?id=3adde30af52d4be347d610c0bdd543e0fdd6d64d'>gnu: Add sdkmanager.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/android.scm (sdkmanager): New variable.

Co-authored-by: Andreas Enge &lt;andreas@enge.fr&gt;
</span></span></td><td>Distopico</td></tr>
<tr><td><span title='2023-04-14 17:15:08 -0400'>2023-04-14</span></td><td><a href='/guix/commit/gnu/packages/android.scm?id=3bacd3c76a58ebe70f98be654f09cbd4166093ab'>Merge branch 'master' into core-updates.</a><span class='msg-avail'>...<span class='msg-tooltip'>Conflicts:
	gnu/local.mk
	gnu/packages/build-tools.scm
	gnu/packages/certs.scm
	gnu/packages/check.scm
	gnu/packages/compression.scm
	gnu/packages/cups.scm
	gnu/packages/fontutils.scm
	gnu/packages/gnuzilla.scm
	gnu/packages/guile.scm
	gnu/packages/ibus.scm
	gnu/packages/image-processing.scm
	gnu/packages/linux.scm
	gnu/packages/music.scm
	gnu/packages/nss.scm
	gnu/packages/pdf.scm
	gnu/packages/python-xyz.scm
	gnu/packages/qt.scm
	gnu/packages/ruby.scm
	gnu/packages/shells.scm
	gnu/packages/tex.scm
	gnu/packages/video.scm
	gnu/packages/vulkan.scm
	gnu/packages/web.scm
	gnu/packages/webkit.scm
	gnu/packages/wm.scm
</span></span></td><td>Maxim Cournoyer</td></tr>
<tr><td><span title='2023-03-21 14:06:47 -0400'>2023-03-21</span></td><td><a href='/guix/commit/gnu/packages/android.scm?id=d44970748f6f8dc889e75fd78851bce7c6730d8b'>gnu: fdroidcl: Update to 0.7.0.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/android.scm (fdroidcl): Update to 0.7.0.

Signed-off-by: Maxim Cournoyer &lt;maxim.cournoyer@gmail.com&gt;
</span></span></td><td>Sergey Trofimov</td></tr>
<tr><td><span title='2023-02-25 18:17:43 +0100'>2023-02-25</span></td><td><a href='/guix/commit/gnu/packages/android.scm?id=d83f4342f9e6090c82d79838732631aee744b7f3'>gnu: Remove python-android-backup.</a><span class='msg-avail'>...<span class='msg-tooltip'>The last release of the package dates from 2018.
It depends on the cryptography library python-pycrypto, which has had
its last release in 2013 and "is unmaintained, obsolete, and contains
security vulnerabilities" according to its homepage.

* gnu/packages/android.scm (python-android-backup): Delete variable.
</span></span></td><td>Andreas Enge</td></tr>
<tr><td><span title='2023-02-25 18:17:11 +0100'>2023-02-25</span></td><td><a href='/guix/commit/gnu/packages/android.scm?id=2ba041dcdf7a17a27a5cf3f6643602396ab5f22e'>gnu: python-miio: Update to 0.5.12.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/android.scm (python-miio): Update to 0.5.12.
[propagated-inputs]: Remove python-android-backup.
</span></span></td><td>Andreas Enge</td></tr>