Update shim to 15.8

Use RockyLinux shim, they have all variants (x86_64, aa64, ia32).
After Windows update KB5041585, the old shim SBAT is not accepted.

Fixes #197.

shim-signed/COPYRIGHT

@@ -1,55 +1,30 @@
-Format: http://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
-Upstream-Name: shim
-Upstream-Contact: Peter Jones <pjones@redhat.com>
-Source: https://github.com/rhboot/shim
+Copyright 2012 Red Hat, Inc <mjg@redhat.com>
 
-Files: *
-Copyright: 2012 Red Hat, Inc
-	2009-2012 Intel Corporation
-License: BSD-2-Clause
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
 
-Files: debian/po/cs.po
-Copyright: 2018 Michal Simunek <michal.simunek@gmail.com>
-License: BSD-2-Clause
+Redistributions of source code must retain the above copyright
+notice, this list of conditions and the following disclaimer.
 
-Files: debian/po/de.po
-Copyright: 2017, 2018 Markus Hiereth <markus.hiereth@freenet.de>
-License: BSD-2-Clause
+Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the
+distribution.
 
-Files: debian/po/fr.po
-Copyright: 2017, 2018 Alban Vidal <alban.vidal@zordhak.fr>
-License: BSD-2-Clause
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
+INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+OF THE POSSIBILITY OF SUCH DAMAGE.
 
-Files: debian/po/nl.po
-Copyright: 2017, 2018 Frans Spiesschaert <Frans.Spiesschaert@yucom.be>
-License: BSD-2-Clause
-
-Files: debian/po/pt.po
-Copyright: 2017, 2018 Rui Branco <ruipb@debianpt.org>
-License: BSD-2-Clause
-
-License: BSD-2-Clause
- Redistribution and use in source and binary forms, with or without
- modification, are permitted provided that the following conditions
- are met:
- .
- Redistributions of source code must retain the above copyright
- notice, this list of conditions and the following disclaimer.
- .
- Redistributions in binary form must reproduce the above copyright
- notice, this list of conditions and the following disclaimer in the
- documentation and/or other materials provided with the
- distribution.
- .
- THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
- FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
- COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
- INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
- (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
- SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
- STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
- ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
- OF THE POSSIBILITY OF SUCH DAMAGE.
+Significant portions of this code are derived from Tianocore
+(http://tianocore.sf.net) and are Copyright 2009-2012 Intel
+Corporation.