Fix docker build (#323)

* fix repos for clang
* fix path for CLANG_FORMAT_BIN in syntax_check.sh
* get version for clang-format
* fix versions for clang-format

docker/syntax_check.sh

@@ -18,6 +18,7 @@ C_FILES=$(find . \
     -name *.c -o -name *.h -o -name *.cpp)
 
 ulimit -s 65536
+$CLANG_FORMAT_BIN --version
 $CLANG_FORMAT_BIN --verbose -style=file -n --Werror --ferror-limit=0 $C_FILES
 c_syntax_rc=$?