UBUNTU: [Config] Disable a.out support

BugLink: https://launchpad.net/bugs/1818552

The a.out core dump handler is broken and will be removed in 5.1 with
upstream commit 08300f44 ("a.out: remove core dumping support").
Additionally, all a.out support will be deprecated in 5.1 with upstream
commit eac61655 ("x86: Deprecate a.out support") and completely
removed in a future release.

Disable it in Ubuntu since it is risky to leave enabled and there are
likely no users that depend on it.
Signed-off-by: Tyler Hicks <tyhicks@canonical.com>
Acked-by: Colin Ian King <colin.king@canonical.com>
Acked-By: You-Sheng Yang <vicamo.yang@canonical.com>
Signed-off-by: Seth Forshee <seth.forshee@canonical.com>
Signed-off-by: Kleber Sacilotto de Souza <kleber.souza@canonical.com>

debian.master/abi/4.4.0-148.174/i386/generic.modules

@@ -469,7 +469,6 @@ bfusb
 bh1750
 bh1770glc
 bh1780gli
-binfmt_aout
 binfmt_misc
 block2mtd
 blocklayoutdriver

debian.master/abi/4.4.0-148.174/i386/lowlatency.modules

@@ -469,7 +469,6 @@ bfusb
 bh1750
 bh1770glc
 bh1780gli
-binfmt_aout
 binfmt_misc
 block2mtd
 blocklayoutdriver

debian.master/config/annotations

@@ -7215,12 +7215,13 @@ CONFIG_CPU_LITTLE_ENDIAN                        policy<{'powerpc-powerpc64-smp':
 CONFIG_BINFMT_ELF                               policy<{'amd64': 'y', 'arm64': 'y', 'armhf': 'y', 'i386': 'y', 'powerpc': 'y', 'ppc64el': 'y', 's390x': 'y'}>
 CONFIG_CORE_DUMP_DEFAULT_ELF_HEADERS            policy<{'amd64': 'y', 'arm64': 'y', 'armhf': 'y', 'i386': 'y', 'powerpc': 'y', 'ppc64el': 'y', 's390x': 'y'}>
 CONFIG_BINFMT_SCRIPT                            policy<{'amd64': 'y', 'arm64': 'y', 'armhf': 'y', 'i386': 'y', 'powerpc': 'y', 'ppc64el': 'y', 's390x': 'y'}>
-CONFIG_BINFMT_AOUT                              policy<{'i386': 'm'}>
+CONFIG_BINFMT_AOUT                              policy<{'i386': 'n'}>
 CONFIG_BINFMT_MISC                              policy<{'amd64': 'm', 'arm64': 'm', 'armhf': 'm', 'i386': 'm', 'powerpc': 'm', 'ppc64el': 'm', 's390x': 'm'}>
 CONFIG_COREDUMP                                 policy<{'amd64': 'y', 'arm64': 'y', 'armhf': 'y', 'i386': 'y', 'powerpc': 'y', 'ppc64el': 'y', 's390x': 'y'}>
 CONFIG_SECCOMP                                  policy<{'amd64': 'y', 'arm64': 'y', 'armhf': 'y', 'i386': 'y', 'powerpc': 'y', 'ppc64el': 'y', 's390x': 'y'}>
 #
 CONFIG_BINFMT_SCRIPT                            mark<ENFORCED> note<required if 'init' is a shell script such as in initramfs-tools>
+CONFIG_BINFMT_AOUT                              mark<ENFORCED> note<LP:#1818552>
 CONFIG_SECCOMP                                  mark<ENFORCED>
 
 # Menu: Executable file formats / Emulations >> Architecture: arm
@@ -7232,7 +7233,7 @@ CONFIG_IA32_EMULATION                           policy<{'amd64': 'y'}>
 CONFIG_IA32_AOUT                                policy<{'amd64': 'n'}>
 CONFIG_X86_X32                                  policy<{'amd64': 'y'}>
 #
-CONFIG_IA32_AOUT                                note<AOUT is deprecated> mark<DEPRECATED>
+CONFIG_IA32_AOUT                                mark<ENFORCED> note<LP:#1818552>
 
 # Menu: File systems
 CONFIG_EXT2_FS                                  policy<{'amd64': 'n', 'arm64': 'n', 'armhf': 'n', 'i386': 'n', 'powerpc': 'n', 'ppc64el': 'n', 's390x': 'n'}>

debian.master/config/config.common.ubuntu

@@ -852,7 +852,7 @@ CONFIG_BH1750=m
 CONFIG_BIG_KEYS=y
 CONFIG_BIG_LITTLE=y
 CONFIG_BINARY_PRINTF=y
-CONFIG_BINFMT_AOUT=m
+# CONFIG_BINFMT_AOUT is not set
 CONFIG_BINFMT_ELF=y
 CONFIG_BINFMT_MISC=m
 CONFIG_BINFMT_SCRIPT=y