Use sourcecode for libjuice

thirdparty/libjuice/fuzzer/README.md

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+## Fuzzer
+
+### Export Symbols
+```
+export CC=clang
+export CXX=clang++
+export CFLAGS=-fsanitize=fuzzer-no-link,address
+export LIB_FUZZING_ENGINE=-fsanitize=fuzzer
+export LDFLAGS=-fsanitize=address
+```
+
+### Build
+```
+$ mkdir build
+$ cd build
+$ cmake -DCMAKE_BUILD_TYPE=Debug -DFUZZER=ON -DCMAKE_C_COMPILER=$CC \
+-DCMAKE_C_FLAGS=$CFLAGS -DCMAKE_EXE_LINKER_FLAGS=$CFLAGS \
+-DLIB_FUZZING_ENGINE=$LIB_FUZZING_ENGINE \
+../
+```
+
+### Run
+```
+$ mkdir coverage
+$ ./fuzzer coverage/ ../fuzzer/input/
+```