Updated most musl versions in CI docker setup.

ci/docker/aarch64-unknown-linux-musl/Dockerfile

@@ -3,14 +3,14 @@ FROM ubuntu:18.04
 RUN apt-get update && apt-get install -y --no-install-recommends \
   gcc make libc6-dev git curl ca-certificates \
   gcc-aarch64-linux-gnu qemu-user
-RUN curl --retry 5 https://www.musl-libc.org/releases/musl-1.1.19.tar.gz | \
+RUN curl --retry 5 https://www.musl-libc.org/releases/musl-1.1.22.tar.gz | \
     tar xzf - && \
-    cd musl-1.1.19 && \
+    cd musl-1.1.22 && \
     CC=aarch64-linux-gnu-gcc \
     ./configure --prefix=/musl-aarch64 --enable-wrapper=yes && \
     make install -j4 && \
     cd .. && \
-    rm -rf musl-1.1.19
+    rm -rf musl-1.1.22
 # Install linux kernel headers sanitized for use with musl
 RUN curl --retry 5 -L https://github.com/sabotage-linux/kernel-headers/archive/v3.12.6-6.tar.gz | \
     tar xzf - && \

ci/docker/arm-unknown-linux-musleabihf/Dockerfile

@@ -4,8 +4,8 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
   gcc make libc6-dev git curl ca-certificates \
   gcc-arm-linux-gnueabihf qemu-user
 
-RUN curl --retry 5 https://www.musl-libc.org/releases/musl-1.1.19.tar.gz | tar xzf -
-WORKDIR /musl-1.1.19
+RUN curl --retry 5 https://www.musl-libc.org/releases/musl-1.1.22.tar.gz | tar xzf -
+WORKDIR /musl-1.1.22
 RUN CC=arm-linux-gnueabihf-gcc \
     CFLAGS="-march=armv6 -marm -mfpu=vfp" \
     ./configure --prefix=/musl-arm --enable-wrapper=yes

ci/docker/i686-unknown-linux-musl/Dockerfile

@@ -12,13 +12,13 @@ RUN apt-get install -y --no-install-recommends \
 #   since otherwise the script will fail to find a compiler.
 # * We manually unset CROSS_COMPILE when running make; otherwise the makefile
 #   will call the non-existent binary 'i686-ar'.
-RUN curl --retry 5 https://www.musl-libc.org/releases/musl-1.1.19.tar.gz | \
+RUN curl --retry 5 https://www.musl-libc.org/releases/musl-1.1.22.tar.gz | \
     tar xzf - && \
-    cd musl-1.1.19 && \
+    cd musl-1.1.22 && \
     CC=gcc CFLAGS=-m32 ./configure --prefix=/musl-i686 --disable-shared --target=i686 && \
     make CROSS_COMPILE= install -j4 && \
     cd .. && \
-    rm -rf musl-1.1.19
+    rm -rf musl-1.1.22
 # Install linux kernel headers sanitized for use with musl
 RUN curl --retry 5 -L https://github.com/sabotage-linux/kernel-headers/archive/v3.12.6-6.tar.gz | \
     tar xzf - && \

ci/docker/x86_64-unknown-linux-musl/Dockerfile

@@ -3,13 +3,13 @@ FROM ubuntu:18.04
 RUN apt-get update
 RUN apt-get install -y --no-install-recommends \
   gcc make libc6-dev git curl ca-certificates
-RUN curl --retry 5 https://www.musl-libc.org/releases/musl-1.1.19.tar.gz | \
+RUN curl --retry 5 https://www.musl-libc.org/releases/musl-1.1.22.tar.gz | \
     tar xzf - && \
-    cd musl-1.1.19 && \
+    cd musl-1.1.22 && \
     ./configure --prefix=/musl-x86_64 && \
     make install -j4 && \
     cd .. && \
-    rm -rf musl-1.1.19
+    rm -rf musl-1.1.22
 # Install linux kernel headers sanitized for use with musl
 RUN curl --retry 5 -L https://github.com/sabotage-linux/kernel-headers/archive/v3.12.6-6.tar.gz | \
     tar xzf - && \