Set CONFIG_LEGACY_VSYSCALL to NONE and vsyscall=emulate

Regenerated the kernel config from container, which bumped the kernel
version and included some other fixes.  Also bumps the check-config
container to check for VSYSCALL_NATIVE

Signed-off-by: Riyaz Faizullabhoy <riyaz.faizullabhoy@docker.com>

alpine/kernel/kernel_config

@@ -1,6 +1,6 @@
 #
 # Automatically generated file; DO NOT EDIT.
-# Linux/x86 4.8.8 Kernel Configuration
+# Linux/x86 4.8.12 Kernel Configuration
 #
 CONFIG_64BIT=y
 CONFIG_X86_64=y
@@ -238,7 +238,6 @@ CONFIG_SLAB=y
 # CONFIG_SYSTEM_DATA_VERIFICATION is not set
 CONFIG_PROFILING=y
 CONFIG_TRACEPOINTS=y
-CONFIG_KEXEC_CORE=n
 CONFIG_OPROFILE=y
 # CONFIG_OPROFILE_EVENT_MULTIPLEX is not set
 CONFIG_HAVE_OPROFILE=y
@@ -552,9 +551,8 @@ CONFIG_HZ_100=y
 # CONFIG_HZ_1000 is not set
 CONFIG_HZ=100
 CONFIG_SCHED_HRTICK=y
-CONFIG_KEXEC=n
-CONFIG_KEXEC_FILE=n
-# CONFIG_KEXEC_VERIFY_SIG is not set
+# CONFIG_KEXEC is not set
+# CONFIG_KEXEC_FILE is not set
 # CONFIG_CRASH_DUMP is not set
 CONFIG_PHYSICAL_START=0x1000000
 CONFIG_RELOCATABLE=y
@@ -565,8 +563,8 @@ CONFIG_HOTPLUG_CPU=y
 # CONFIG_DEBUG_HOTPLUG_CPU0 is not set
 # CONFIG_COMPAT_VDSO is not set
 # CONFIG_LEGACY_VSYSCALL_NATIVE is not set
-CONFIG_LEGACY_VSYSCALL_EMULATE=y
-# CONFIG_LEGACY_VSYSCALL_NONE is not set
+# CONFIG_LEGACY_VSYSCALL_EMULATE is not set
+CONFIG_LEGACY_VSYSCALL_NONE=y
 # CONFIG_CMDLINE_BOOL is not set
 CONFIG_MODIFY_LDT_SYSCALL=y
 CONFIG_HAVE_LIVEPATCH=y
@@ -2809,7 +2807,6 @@ CONFIG_EFI_VARS=y
 CONFIG_EFI_ESRT=y
 CONFIG_EFI_VARS_PSTORE=y
 # CONFIG_EFI_VARS_PSTORE_DEFAULT_DISABLE is not set
-CONFIG_EFI_RUNTIME_MAP=y
 # CONFIG_EFI_FAKE_MEMMAP is not set
 CONFIG_EFI_RUNTIME_WRAPPERS=y
 # CONFIG_EFI_BOOTLOADER_CONTROL is not set
@@ -3587,7 +3584,6 @@ CONFIG_ASSOCIATIVE_ARRAY=y
 CONFIG_HAS_IOMEM=y
 CONFIG_HAS_IOPORT_MAP=y
 CONFIG_HAS_DMA=y
-CONFIG_CPUMASK_OFFSTACK=y
 CONFIG_CPU_RMAP=y
 CONFIG_DQL=y
 CONFIG_GLOB=y