Make some of the changes needed to the 'makeicecat' script, to allow it to run
in a snippet without network access.  After this patch is applied, some
additional changes will be made using 'substitute*'.

diff --git a/makeicecat b/makeicecat
index bf2b7a6..bc3b19b 100755
--- a/makeicecat
+++ b/makeicecat
@@ -56,7 +56,7 @@ readonly SOURCEDIR=icecat-${FFVERSION}
 # debug/shell options
 readonly DEVEL=0
 set -euo pipefail
-(( DEVEL )) && set -x
+set -x
 
 
 ###############################################################################
@@ -455,7 +455,7 @@ configure_search()
 
 
     # Process various JSON pre-configuration dumps.
-    python3 ../../tools/process-json-files.py . browser/components/extensions/schemas/
+    python3 "${DATADIR}"/../tools/process-json-files.py . browser/components/extensions/schemas/
 }
 
 configure_mobile()
@@ -837,12 +837,12 @@ finalize_sourceball()
 # entry point
 ###############################################################################
 
-validate_env || exit 1
-prepare_env
-fetch_source
-verify_sources
-extract_sources
-fetch_l10n
+# validate_env || exit 1
+# prepare_env
+# fetch_source
+# verify_sources
+# extract_sources
+# fetch_l10n
 apply_patches
 configure
 configure_search
@@ -854,4 +854,4 @@ prepare_macos_packaging
 configure_extensions
 configure_onboarding
 apply_bugfixes
-finalize_sourceball
+# finalize_sourceball
='/guix/commit/tests/modules.scm?id=c4eccd20664a0f9d9134d98a5b430f67e84176c7'>commit</a><a href='/guix/diff/tests/modules.scm?id=c4eccd20664a0f9d9134d98a5b430f67e84176c7'>diff</a></td><td class='form'><form class='right' method='get' action='/guix/log/tests/modules.scm'>
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<div class='path'>path: <a href='/guix/log/?id=c4eccd20664a0f9d9134d98a5b430f67e84176c7&amp;showmsg=1'>root</a>/<a href='/guix/log/tests?id=c4eccd20664a0f9d9134d98a5b430f67e84176c7&amp;showmsg=1'>tests</a>/<a href='/guix/log/tests/modules.scm?id=c4eccd20664a0f9d9134d98a5b430f67e84176c7&amp;showmsg=1'>modules.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/tests/modules.scm?id=c4eccd20664a0f9d9134d98a5b430f67e84176c7'>Collapse</a>)</th><th class='left'>Author</th></tr>
<tr class='logheader'><td><span title='2021-12-23 10:54:00 +0100'>2021-12-23</span></td><td class='logsubject'><a href='/guix/commit/tests/modules.scm?id=05a9d1f378e2e13e8f759be926ea368358afc27c'>Remove VM generation dead-code.</a></td><td>Mathieu Othacehe</td></tr>
<tr class='nohover-highlight'><td/><td colspan='3' class='logmsg'>
This code duplicates the (gnu system image) and (gnu build image) code. Using
VM for image generation is not needed, not portable and really slow. Remove
all the VM image generation code to make sure that only the image API is used.

* gnu/build/vm.scm: Remove it. Move the qemu-command procedure to ...
* gnu/build/marionette.scm: ... here.
* gnu/local.mk (GNU_SYSTEM_MODULES): Adapt it.
* tests/modules.scm: Ditto.
* gnu/tests/install.scm: Ditto.
* gnu/system/vm.scm: Adapt it and remove expression-&gt;derivation-in-linux-vm,
qemu-img, system-qemu-image/shared-store and system-docker-image procedures.
* doc/guix.texi (G-Expressions): Adapt it.


</td></tr>