Use upstream utf8proc package, as suggested in
http://source.netsurf-browser.org/libutf8proc.git/commit/?id=770e329cceaf0620c7b482589a9b17ed1d19c16d

Work around upstream's lack of a pkg-config file and update API.

--- netsurf-3.6/Makefile
+++ netsurf-3.6/Makefile
@@ -527,10 +527,9 @@
 $(eval $(call pkg_config_find_and_add,libcss,CSS))
 $(eval $(call pkg_config_find_and_add,libdom,DOM))
 $(eval $(call pkg_config_find_and_add,libnsutils,nsutils))
-$(eval $(call pkg_config_find_and_add,libutf8proc,utf8proc))
 
 # Common libraries without pkg-config support
-LDFLAGS += -lz
+LDFLAGS += -lz -lutf8proc
 
 # Optional libraries with pkgconfig
 
--- netsurf-3.8/utils/idna.c
+++ netsurf-3.8/utils/idna.c
@@ -27,7 +27,7 @@
 #include <stdlib.h>
 #include <string.h>
 #include <sys/types.h>
-#include <libutf8proc/utf8proc.h>
+#include <utf8proc.h>
 
 #include "netsurf/inttypes.h"
 
--- netsurf-3.8/test/Makefile
+++ netsurf-3.8/test/Makefile
@@ -142,14 +142,15 @@
 	-Itest -Iinclude -Icontent/handlers -Ifrontends -I. -I.. \
 	-Dnsgtk \
 	$(SAN_FLAGS) \
-	$(shell pkg-config --cflags libcurl libparserutils libwapcaplet libdom libnsutils libutf8proc) \
+	$(shell pkg-config --cflags libcurl libparserutils libwapcaplet libdom libnsutils) \
 	$(LIB_CFLAGS)
 TESTCFLAGS := $(BASE_TESTCFLAGS) \
 	$(COV_CFLAGS) \
 	$(COV_CPPFLAGS)
 
 TESTLDFLAGS := -L$(TESTROOT) \
-	$(shell pkg-config --libs libcurl libparserutils libwapcaplet libdom libnsutils libutf8proc) -lz \
+	$(shell pkg-config --libs libcurl libparserutils libwapcaplet libdom libnsutils) \
+	$(LDFLAGS) \
 	$(SAN_FLAGS) \
 	$(LIB_LDFLAGS)\
 	$(COV_LDFLAGS)
og/gnu/packages/cyrus-sasl.scm'>
<input type='hidden' name='id' value='2e8700052e26566b9c17563cf0a3d0979da6fbd1'/><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=2e8700052e26566b9c17563cf0a3d0979da6fbd1'>root</a>/<a href='/guix/log/gnu?id=2e8700052e26566b9c17563cf0a3d0979da6fbd1'>gnu</a>/<a href='/guix/log/gnu/packages?id=2e8700052e26566b9c17563cf0a3d0979da6fbd1'>packages</a>/<a href='/guix/log/gnu/packages/cyrus-sasl.scm?id=2e8700052e26566b9c17563cf0a3d0979da6fbd1'>cyrus-sasl.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/cyrus-sasl.scm?id=2e8700052e26566b9c17563cf0a3d0979da6fbd1&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2022-07-23 19:43:11 +0200'>2022-07-23</span></td><td><a href='/guix/commit/gnu/packages/cyrus-sasl.scm?id=0de5e6d6536a7bc94dd71047cf9573d71fa8d4b0'>gnu: cyrus-sasl: Do not propagate Kerberos.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/cyrus-sasl.scm (cyrus-sasl)[propagated-inputs]: Move MIT-KRB5 ...
[inputs]: ... here.
* gnu/packages/openldap.scm (openldap)[arguments]: Don't add krb5 linker arguments.
</span></span></td><td>Marius Bakke</td></tr>
<tr><td><span title='2022-07-23 19:43:10 +0200'>2022-07-23</span></td><td><a href='/guix/commit/gnu/packages/cyrus-sasl.scm?id=1ecf710caed394e066aa0e5a74aa5128d777a329'>gnu: cyrus-sasl: Fix indentation.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/cyrus-sasl.scm (cyrus-sasl): Reindent.
</span></span></td><td>Marius Bakke</td></tr>
<tr><td><span title='2022-07-23 19:43:10 +0200'>2022-07-23</span></td><td><a href='/guix/commit/gnu/packages/cyrus-sasl.scm?id=093f13610bf50762040696b320b69f6e9376ef34'>gnu: cyrus-sasl: Update to 2.1.28.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/cyrus-sasl.scm (cyrus-sasl): Update to 2.1.28.
[source](uri): Use new download location.
[source](patches): Remove.
[native-inputs]: Remove.
[arguments]: Remove #:phases.  Use G-expression.
* gnu/packages/patches/cyrus-sasl-CVE-2019-19906.patch,
gnu/packages/patches/cyrus-sasl-ac-try-run-fix.patch: Delete files.
* gnu/local.mk (dist_patch_DATA): Adjust accordingly.
</span></span></td><td>Marius Bakke</td></tr>
<tr><td><span title='2021-12-13 17:48:25 +0100'>2021-12-13</span></td><td><a href='/guix/commit/gnu/packages/cyrus-sasl.scm?id=8394619baceb118df92e355377fd543bb1aa501a'>gnu: Simplify package inputs.</a><span class='msg-avail'>...<span class='msg-tooltip'>This commit was obtained by running:

  ./pre-inst-env guix style

without any additional argument.
</span></span></td><td>Ludovic Courtès</td></tr>