build: use focal in gitian descriptors

Compilers used change as follows:
Linux native GCC 7.5 -> GCC 8.4
Linux cross GCC 8.4 -> GCC 8.4
Windows mingw-w64 7.3 -> mingw-w64 9.3
macOS Clang 8.0.0 -> Clang 8.0.0

The macOS and Win cross builds in the CI are updated to use Focal, and
per the op, running the security tests is disabled in the Windows
build.

contrib/gitian-build.py

@@ -35,14 +35,14 @@ def setup():
     if not os.path.isdir('bitcoin'):
         subprocess.check_call(['git', 'clone', 'https://github.com/bitcoin/bitcoin.git'])
     os.chdir('gitian-builder')
-    make_image_prog = ['bin/make-base-vm', '--suite', 'bionic', '--arch', 'amd64']
+    make_image_prog = ['bin/make-base-vm', '--suite', 'focal', '--arch', 'amd64']
     if args.docker:
         make_image_prog += ['--docker']
     elif not args.kvm:
         make_image_prog += ['--lxc']
     subprocess.check_call(make_image_prog)
     os.chdir(workdir)
-    if args.is_bionic and not args.kvm and not args.docker:
+    if args.is_focal and not args.kvm and not args.docker:
         subprocess.check_call(['sudo', 'sed', '-i', 's/lxcbr0/br0/', '/etc/default/lxc-net'])
         print('Reboot is required')
         sys.exit(0)
@@ -176,7 +176,7 @@ def main():
     args = parser.parse_args()
     workdir = os.getcwd()
 
-    args.is_bionic = b'bionic' in subprocess.check_output(['lsb_release', '-cs'])
+    args.is_focal = b'focal' in subprocess.check_output(['lsb_release', '-cs'])
 
     if args.kvm and args.docker:
         raise Exception('Error: cannot have both kvm and docker')

contrib/gitian-descriptors/gitian-linux.yml

@@ -3,7 +3,7 @@ name: "bitcoin-core-linux-22"
 enable_cache: true
 distro: "ubuntu"
 suites:
-- "bionic"
+- "focal"
 architectures:
 - "amd64"
 packages:
@@ -15,6 +15,8 @@ packages:
 - "ca-certificates"
 - "curl"
 - "faketime"
+- "g++-8"
+- "gcc-8"
 - "git"
 - "libtool"
 - "patch"
@@ -107,7 +109,7 @@ script: |
   BASEPREFIX="${PWD}/depends"
   # Build dependencies for each host
   for i in $HOSTS; do
-    make ${MAKEOPTS} -C ${BASEPREFIX} HOST="${i}"
+    make ${MAKEOPTS} -C ${BASEPREFIX} HOST="${i}" CC=${i}-gcc-8 CXX=${i}-g++-8
   done
 
   # Faketime for binaries
@@ -144,7 +146,7 @@ script: |
     tar --strip-components=1 -xf "${GIT_ARCHIVE}"
 
     ./autogen.sh
-    CONFIG_SITE=${BASEPREFIX}/${i}/share/config.site ./configure --prefix=/ --disable-ccache --disable-maintainer-mode --disable-dependency-tracking ${CONFIGFLAGS} CFLAGS="${HOST_CFLAGS}" CXXFLAGS="${HOST_CXXFLAGS}" LDFLAGS="${HOST_LDFLAGS}"
+    CONFIG_SITE=${BASEPREFIX}/${i}/share/config.site ./configure --prefix=/ --disable-ccache --disable-maintainer-mode --disable-dependency-tracking ${CONFIGFLAGS} CFLAGS="${HOST_CFLAGS}" CXXFLAGS="${HOST_CXXFLAGS}" LDFLAGS="${HOST_LDFLAGS}" CC=${i}-gcc-8 CXX=${i}-g++-8
     make ${MAKEOPTS}
     make ${MAKEOPTS} -C src check-security
     make ${MAKEOPTS} -C src check-symbols

contrib/gitian-descriptors/gitian-osx-signer.yml

@@ -2,7 +2,7 @@
 name: "bitcoin-dmg-signer"
 distro: "ubuntu"
 suites:
-- "bionic"
+- "focal"
 architectures:
 - "amd64"
 packages:

contrib/gitian-descriptors/gitian-osx.yml

@@ -3,7 +3,7 @@ name: "bitcoin-core-osx-22"
 enable_cache: true
 distro: "ubuntu"
 suites:
-- "bionic"
+- "focal"
 architectures:
 - "amd64"
 packages:
@@ -29,6 +29,7 @@ packages:
 - "python3-setuptools"
 - "fonts-tuffy"
 - "xorriso"
+- "libtinfo5"
 remotes:
 - "url": "https://github.com/bitcoin/bitcoin.git"
   "dir": "bitcoin"

contrib/gitian-descriptors/gitian-win-signer.yml

@@ -2,7 +2,7 @@
 name: "bitcoin-win-signer"
 distro: "ubuntu"
 suites:
-- "bionic"
+- "focal"
 architectures:
 - "amd64"
 packages:

contrib/gitian-descriptors/gitian-win.yml

@@ -3,7 +3,7 @@ name: "bitcoin-core-win-22"
 enable_cache: true
 distro: "ubuntu"
 suites:
-- "bionic"
+- "focal"
 architectures:
 - "amd64"
 packages: