Debian 6 doesn't have ninja, so use make for the dist builds

Author: joshtriplett

src/ci/docker/host-x86_64/dist-i686-linux/Dockerfile

@@ -26,7 +26,6 @@ RUN apt-get update && \
       libedit-dev \
       libncurses-dev \
       make \
-      ninja-build \
       patch \
       perl \
       pkg-config \
@@ -94,6 +93,7 @@ ENV RUST_CONFIGURE_ARGS \
       --enable-profiler \
       --set target.i686-unknown-linux-gnu.linker=clang \
       --build=i686-unknown-linux-gnu \
+      --set llvm.ninja=false \
       --set rust.jemalloc
 ENV SCRIPT python2.7 ../x.py dist --build $HOSTS --host $HOSTS --target $HOSTS
 ENV CARGO_TARGET_I686_UNKNOWN_LINUX_GNU_LINKER=clang

src/ci/docker/host-x86_64/dist-x86_64-linux/Dockerfile

@@ -26,7 +26,6 @@ RUN apt-get update && \
       libedit-dev \
       libncurses-dev \
       make \
-      ninja-build \
       patch \
       perl \
       pkg-config \
@@ -97,6 +96,7 @@ ENV RUST_CONFIGURE_ARGS \
       --set target.x86_64-unknown-linux-gnu.ar=/rustroot/bin/llvm-ar \
       --set target.x86_64-unknown-linux-gnu.ranlib=/rustroot/bin/llvm-ranlib \
       --set llvm.thin-lto=true \
+      --set llvm.ninja=false \
       --set rust.jemalloc
 ENV SCRIPT python2.7 ../x.py dist --host $HOSTS --target $HOSTS
 ENV CARGO_TARGET_X86_64_UNKNOWN_LINUX_GNU_LINKER=clang