Rename Dockerfile to Dockerfile.in to ensure consistency

All Dockerfiles are now configured similarly, this will support
future improvements.

linux-x64/Dockerfile.in

@@ -0,0 +1,37 @@
+FROM dockcross/base:latest
+MAINTAINER Matt McCormick "matt.mccormick@kitware.com"
+
+RUN apt-get update && \
+    apt-get -y install \
+    libelf-dev \
+    libssl-dev \
+    && apt-get clean --yes
+
+ENV CROSS_TRIPLE x86_64-linux-gnu
+ENV CROSS_ROOT /usr/bin
+ENV AS=/usr/bin/${CROSS_TRIPLE}-as \
+    AR=/usr/bin/${CROSS_TRIPLE}-ar \
+    CC=/usr/bin/${CROSS_TRIPLE}-gcc \
+    CPP=/usr/bin/${CROSS_TRIPLE}-cpp \
+    CXX=/usr/bin/${CROSS_TRIPLE}-g++ \
+    LD=/usr/bin/${CROSS_TRIPLE}-ld \
+    FC=/usr/bin/${CROSS_TRIPLE}-gfortran
+
+COPY ${CROSS_TRIPLE}-noop.sh /usr/bin/${CROSS_TRIPLE}-noop
+
+COPY Toolchain.cmake /usr/lib/${CROSS_TRIPLE}/
+ENV CMAKE_TOOLCHAIN_FILE /usr/lib/${CROSS_TRIPLE}/Toolchain.cmake
+
+# Build-time metadata as defined at http://label-schema.org
+ARG BUILD_DATE
+ARG IMAGE
+ARG VERSION=latest
+ARG VCS_REF
+ARG VCS_URL
+LABEL org.label-schema.build-date=$BUILD_DATE \
+      org.label-schema.name=$IMAGE \
+      org.label-schema.version=$VERSION \
+      org.label-schema.vcs-ref=$VCS_REF \
+      org.label-schema.vcs-url=$VCS_URL \
+      org.label-schema.schema-version="1.0"
+ENV DEFAULT_DOCKCROSS_IMAGE ${IMAGE}:${VERSION}