Make weasyprint load dynamic libraries from hard-coded path.

From NixOS
pkgs/development/python-modules/weasyprint/library-paths.patch

diff --git a/weasyprint/fonts.py b/weasyprint/fonts.py
index 377716c1..2016e01c 100644
--- a/weasyprint/fonts.py
+++ b/weasyprint/fonts.py
@@ -48,11 +48,8 @@ else:
     # with OSError: dlopen() failed to load a library: cairo / cairo-2
     # So let's hope we find the same file as cairo already did ;)
     # Same applies to pangocairo requiring pangoft2
-    fontconfig = dlopen(ffi, 'fontconfig', 'libfontconfig',
-                        'libfontconfig-1.dll',
-                        'libfontconfig.so.1', 'libfontconfig-1.dylib')
-    pangoft2 = dlopen(ffi, 'pangoft2-1.0', 'libpangoft2-1.0-0',
-                      'libpangoft2-1.0.so', 'libpangoft2-1.0.dylib')
+    fontconfig = dlopen(ffi, '@fontconfig@')
+    pangoft2 = dlopen(ffi, '@pangoft2@')
 
     ffi.cdef('''
         // FontConfig
diff --git a/weasyprint/text.py b/weasyprint/text.py
index 035074e9..08e40395 100644
--- a/weasyprint/text.py
+++ b/weasyprint/text.py
@@ -243,12 +243,9 @@ def dlopen(ffi, *names):
     return ffi.dlopen(names[0])  # pragma: no cover
 
 
-gobject = dlopen(ffi, 'gobject-2.0', 'libgobject-2.0-0', 'libgobject-2.0.so',
-                 'libgobject-2.0.dylib')
-pango = dlopen(ffi, 'pango-1.0', 'libpango-1.0-0', 'libpango-1.0.so',
-               'libpango-1.0.dylib')
-pangocairo = dlopen(ffi, 'pangocairo-1.0', 'libpangocairo-1.0-0',
-                    'libpangocairo-1.0.so', 'libpangocairo-1.0.dylib')
+gobject = dlopen(ffi, '@gobject@')
+pango = dlopen(ffi, '@pango@')
+pangocairo = dlopen(ffi, '@pangocairo@')
 
 gobject.g_type_init()
 
80929f4ecf7d7f1aa9'/><select name='qt'>
<option value='grep'>log msg</option>
<option value='author'>author</option>
<option value='committer'>committer</option>
<option value='range'>range</option>
</select>
<input class='txt' type='search' size='10' name='q' value=''/>
<input type='submit' value='search'/>
</form>
</td></tr></table>
<div class='path'>path: <a href='/guix/log/?id=ae98caf5bca3cab25bffd180929f4ecf7d7f1aa9'>root</a>/<a href='/guix/log/gnu?id=ae98caf5bca3cab25bffd180929f4ecf7d7f1aa9'>gnu</a>/<a href='/guix/log/gnu/packages?id=ae98caf5bca3cab25bffd180929f4ecf7d7f1aa9'>packages</a>/<a href='/guix/log/gnu/packages/sequoia.scm?id=ae98caf5bca3cab25bffd180929f4ecf7d7f1aa9'>sequoia.scm</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/gnu/packages/sequoia.scm?id=ae98caf5bca3cab25bffd180929f4ecf7d7f1aa9&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2024-07-22 01:00:45 +0300'>2024-07-22</span></td><td><a href='/guix/commit/gnu/packages/sequoia.scm?id=e5c0b62debc6f48a32a65736d9ba3da0b1e59cb9'>gnu: sequoia-sq: Skip a test.</a><span class='msg-avail'>...</span></td><td>Efraim Flashner</td></tr>
<tr><td><span title='2024-07-19 00:46:09 +0300'>2024-07-19</span></td><td><a href='/guix/commit/gnu/packages/sequoia.scm?id=a2553bf847c9eabeff884c0804c8689ddb89f673'>gnu: sequoia-sq: Update to 0.34.0.</a><span class='msg-avail'>...</span></td><td>Efraim Flashner</td></tr>
<tr><td><span title='2024-07-19 00:46:08 +0300'>2024-07-19</span></td><td><a href='/guix/commit/gnu/packages/sequoia.scm?id=bc7cd582eb32a10abe9374ac6370a5fcb854ea8a'>gnu: Add rust-sequoia-keystore-0.2.</a><span class='msg-avail'>...</span></td><td>Efraim Flashner</td></tr>
<tr><td><span title='2024-07-19 00:46:08 +0300'>2024-07-19</span></td><td><a href='/guix/commit/gnu/packages/sequoia.scm?id=65af5469c0f6261d9ae685f5edf59268270c4ccc'>gnu: Add rust-sequoia-keystore-backend-0.2.</a><span class='msg-avail'>...</span></td><td>Efraim Flashner</td></tr>
<tr><td><span title='2024-07-19 00:46:08 +0300'>2024-07-19</span></td><td><a href='/guix/commit/gnu/packages/sequoia.scm?id=b18cc7860c7f964e514743961697c5beda6c82a5'>gnu: Add rust-sequoia-keystore-softkeys-0.2.</a><span class='msg-avail'>...</span></td><td>Efraim Flashner</td></tr>
<tr><td><span title='2024-07-19 00:46:07 +0300'>2024-07-19</span></td><td><a href='/guix/commit/gnu/packages/sequoia.scm?id=a3abfa83c456ae1bec95853ac329c430bb23232f'>gnu: Add rust-sequoia-net-0.28.</a><span class='msg-avail'>...</span></td><td>Efraim Flashner</td></tr>
<tr><td><span title='2024-07-19 00:46:07 +0300'>2024-07-19</span></td><td><a href='/guix/commit/gnu/packages/sequoia.scm?id=fe037b6d5ed89bfae612d4b42c7fd3f0efaeeb47'>gnu: Add rust-sequoia-ipc-0.33.</a><span class='msg-avail'>...</span></td><td>Efraim Flashner</td></tr>
<tr><td><span title='2024-07-19 00:46:07 +0300'>2024-07-19</span></td><td><a href='/guix/commit/gnu/packages/sequoia.scm?id=1d49e8e5bcf0cf242653f93541c68928402ab1c3'>gnu: Add rust-sequoia-wot-0.11.</a><span class='msg-avail'>...</span></td><td>Efraim Flashner</td></tr>
<tr><td><span title='2024-07-19 00:46:06 +0300'>2024-07-19</span></td><td><a href='/guix/commit/gnu/packages/sequoia.scm?id=22a921754927702e67b42f3434906bdd5f571f13'>gnu: Add rust-sequoia-cert-store-0.5.</a><span class='msg-avail'>...</span></td><td>Efraim Flashner</td></tr>
<tr><td><span title='2024-07-19 00:46:06 +0300'>2024-07-19</span></td><td><a href='/guix/commit/gnu/packages/sequoia.scm?id=9933b0f26288d062d36d8dab48beaa46f040d7b3'>gnu: rust-sequoia-autocrypt-0.25: Update to 0.25.1.</a><span class='msg-avail'>...</span></td><td>Efraim Flashner</td></tr>
<tr><td><span title='2024-07-19 00:46:05 +0300'>2024-07-19</span></td><td><a href='/guix/commit/gnu/packages/sequoia.scm?id=742ebae5c16b721c7236c47e9eccc013d9764505'>gnu: Add rust-openpgp-cert-d-0.3.</a><span class='msg-avail'>...</span></td><td>Efraim Flashner</td></tr>
<tr><td><span title='2024-07-19 00:46:02 +0300'>2024-07-19</span></td><td><a href='/guix/commit/gnu/packages/sequoia.scm?id=d060993c104fcffbcba1555485c253a276775057'>gnu: rust-sequoia-openpgp-1: Update to 1.19.0.</a><span class='msg-avail'>...</span></td><td>Efraim Flashner</td></tr>