Build chain tweaks and cleanup

toolchain/build-musl.sh

@@ -1,6 +1,6 @@
 #!/bin/sh -e
 
-target=x86_64-elf
+TARGET=x86_64-elf
 SYSROOT=/opt/sysroot
 
 # Pull or update musl libc
@@ -10,12 +10,14 @@ cd musl
 git reset --hard
 git pull
 
+# Apply patches
 [ -d /opt/src/patch-musl ] && rsync -a /opt/src/patch-musl/ /opt/external/musl/
 
+# Build and install
 mkdir -p /opt/external/build-musl && cd /opt/external/build-musl
 rm -r *
 ../musl/configure \
-    --target=${target} \
+    --target=${TARGET} \
     --prefix=${SYSROOT}/usr \
     --disable-shared \
     --enable-debug \