buildroot: update to 2019.11

qemu: update to v4.2.0

linux: update to v5.4.3

Make Buildroot use the latest non default GCC 9.2 and binutils 2.32 to be
able to use the latest architecture features.

README.adoc

@@ -1,5 +1,5 @@
 = Linux Kernel Module Cheat
-:description: The perfect emulation setup to study and develop the <<linux-kernel>> v5.2.1, kernel modules, <<qemu-buildroot-setup,QEMU>>, <<gem5-buildroot-setup,gem5>> and x86_64, ARMv7 and ARMv8 <<userland-assembly,userland>> and <<baremetal-setup,baremetal>> assembly, <<c,ANSI C>>, <<cpp,C++>> and <<posix,POSIX>>. <<gdb>> and <<kgdb>> just work. Powered by <<about-the-qemu-buildroot-setup,Buildroot>> and <<about-the-baremetal-setup,crosstool-NG>>. Highly automated. Thoroughly documented. Automated <<test-this-repo,tests>>. "Tested" in an Ubuntu 18.04 host.
+:description: The perfect emulation setup to study and develop the <<linux-kernel>> v5.4.3, kernel modules, <<qemu-buildroot-setup,QEMU>>, <<gem5-buildroot-setup,gem5>> and x86_64, ARMv7 and ARMv8 <<userland-assembly,userland>> and <<baremetal-setup,baremetal>> assembly, <<c,ANSI C>>, <<cpp,C++>> and <<posix,POSIX>>. <<gdb>> and <<kgdb>> just work. Powered by <<about-the-qemu-buildroot-setup,Buildroot>> and <<about-the-baremetal-setup,crosstool-NG>>. Highly automated. Thoroughly documented. Automated <<test-this-repo,tests>>. "Tested" in an Ubuntu 19.10 host.
 :idprefix:
 :idseparator: -
 :nofooter:

buildroot_config/default

@@ -1,3 +1,7 @@
+# Versions of our submodules.
+BR2_BINUTILS_VERSION_2_32_X=y
+BR2_GCC_VERSION_9_X=y
+
 # Toolchain options.
 # Enable as much visibility as possible.
 BR2_CCACHE=y