libgit2: fix build (#9580)

projects/libgit2/build.sh

@@ -31,8 +31,11 @@ for fuzzer in ../fuzzers/*_fuzzer.c
 do
     fuzzer_name=$(basename "${fuzzer%.c}")
 
-    $CC $CFLAGS -c -I./src -I../src/libgit2 -I../src/util -I../include \
+    $CC $CFLAGS -c \
+        -I./src -I./src/util -I./include/ -I./include/git2 \
+        -I../src/libgit2 -I../src/util -I../include \
         "$fuzzer" -o "$WORK/$fuzzer_name.o"
+
     $CXX $CXXFLAGS -std=c++11 -o "$OUT/$fuzzer_name" \
         $LIB_FUZZING_ENGINE "$WORK/$fuzzer_name.o" "$WORK/lib/libgit2.a"