fixup solana makefile to catch more errors

Author: jhunsaker

docker/Dockerfile

@@ -26,7 +26,7 @@ RUN /bin/bash -l -c "pytest-3 --pyargs pyth"
 RUN curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y --default-toolchain none
 
 # Link Solana location for makefile
-RUN mkdir solana && cp -a /usr/bin/sdk solana
+RUN mkdir solana && cp -a /usr/bin/sdk solana && sed -i 's/-Werror/-Wall -Wextra -Wconversion -Werror/g' solana/sdk/bpf/c/bpf.mk
 
 # Build the program
 RUN PATH=$PATH:$HOME/.cargo/bin && cd pyth-client/program && make V=1