Rollup merge of rust-lang#65302 - msizanoen1:fix-armv7-segfault, r=al…

…excrichton

Upgrade GCC to 8.3.0, glibc to 1.17.0 and crosstool-ng to 1.24.0 for dist-armv7-linux

rust-lang#62896 was caused by the usage of the GCC 5.2.0 toolchain, which was released back in 2015 and may have bugs affecting LLVM 9.
This PR upgrade GCC to 8.3.0 from 5.2.0, glibc from 1.16.0 to 1.17.0 and crosstool-ng to 1.24.0 only for dist-armv7-linux.
Fixes rust-lang#62896

r? @alexcrichton

src/ci/docker/README.md

@@ -165,18 +165,17 @@ For targets: `arm-unknown-linux-gnueabihf`
 For targets: `armv7-unknown-linux-gnueabihf`
 
 - Path and misc options > Prefix directory = /x-tools/${CT\_TARGET}
-- Path and misc options > Patches origin = Bundled, then local
-- Path and misc options > Local patch directory = /tmp/patches
+- Path and misc options > Patches origin = Bundled only
 - Target options > Target Architecture = arm
 - Target options > Suffix to the arch-part = v7
 - Target options > Architecture level = armv7-a -- (+)
 - Target options > Use specific FPU = vfpv3-d16 -- (\*)
 - Target options > Floating point = hardware (FPU) -- (\*)
 - Target options > Default instruction set mode = thumb -- (\*)
 - Operating System > Target OS = linux
-- Operating System > Linux kernel version = 3.2.72 -- Precise kernel
-- C-library > glibc version = 2.16.0
-- C compiler > gcc version = 5.2.0
+- Operating System > Linux kernel version = 3.2.101
+- C-library > glibc version = 2.17.0
+- C compiler > gcc version = 8.3.0
 - C compiler > C++ = ENABLE -- to cross compile LLVM
 
 (\*) These options have been selected to match the configuration of the arm

src/ci/docker/dist-armv7-linux/Dockerfile

@@ -3,20 +3,14 @@ FROM ubuntu:16.04
 COPY scripts/cross-apt-packages.sh /scripts/
 RUN sh /scripts/cross-apt-packages.sh
 
-# Ubuntu 16.04 (this container) ships with make 4, but something in the
-# toolchains we build below chokes on that, so go back to make 3
-COPY scripts/make3.sh /scripts/
-RUN sh /scripts/make3.sh
-
-COPY scripts/crosstool-ng.sh /scripts/
+COPY dist-armv7-linux/crosstool-ng.sh /scripts/
 RUN sh /scripts/crosstool-ng.sh
 
 COPY scripts/rustbuild-setup.sh /scripts/
 RUN sh /scripts/rustbuild-setup.sh
 USER rustbuild
 WORKDIR /tmp
 
-COPY dist-armv7-linux/patches/ /tmp/patches/
 COPY dist-armv7-linux/build-toolchains.sh dist-armv7-linux/armv7-linux-gnueabihf.config /tmp/
 RUN ./build-toolchains.sh