update OSS-Fuzz build script

Signed-off-by: Adam Korczynski <[email protected]>

Author: AdamKorcz

tests/fuzz/build.sh

@@ -1,8 +1,7 @@
-cd $SRC/crow
-mkdir -p build
-cmake -S . -B build -DCROW_BUILD_FUZZER=ON -DCROW_BUILD_EXAMPLES=OFF -DCROW_BUILD_TESTS=OFF && cmake --build build --target install
-
-# Build the corpora
-cd tests/fuzz
+mkdir -p build && cd build
+cmake .. -DCROW_BUILD_FUZZER=ON -DCROW_BUILD_EXAMPLES=OFF -DCROW_BUILD_TESTS=ON
+cmake --build . --target install
+make -j$(nproc)
+cd ../tests/fuzz
 zip -q $OUT/template_fuzzer_seed_corpus.zip template_corpus/*
 zip -q $OUT/request_fuzzer_seed_corpus.zip html_corpus/*