fuzz: reorganise the path for existing oss-fuzz fuzzers

In order to provide a better organisation for oss-fuzz fuzzers and
to avoid top-level clustters in the git repository when more fuzzers
are introduced, move the existing fuzzer-related sources to their
own oss-fuzz/ hierarchy.  Grouping the fuzzers into their own
directory, separate their application on fuzz-testing from the core
functionalities of the git code, prvides better and tidier structure
the oss-fuzz fuzzing library to manage, locate, build and execute
those fuzzers for fuzz-testing purposes in future development.

Signed-off-by: Arthur Chan <arthur.chan@adalogics.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

.gitignore

@@ -1,7 +1,4 @@
-/fuzz-commit-graph
 /fuzz_corpora
-/fuzz-pack-headers
-/fuzz-pack-idx
 /GIT-BUILD-OPTIONS
 /GIT-CFLAGS
 /GIT-LDFLAGS

Makefile

@@ -681,9 +681,9 @@ SCRIPTS = $(SCRIPT_SH_GEN) \
 
 ETAGS_TARGET = TAGS
 
-FUZZ_OBJS += fuzz-commit-graph.o
-FUZZ_OBJS += fuzz-pack-headers.o
-FUZZ_OBJS += fuzz-pack-idx.o
+FUZZ_OBJS += oss-fuzz/fuzz-commit-graph.o
+FUZZ_OBJS += oss-fuzz/fuzz-pack-headers.o
+FUZZ_OBJS += oss-fuzz/fuzz-pack-idx.o
 .PHONY: fuzz-objs
 fuzz-objs: $(FUZZ_OBJS)
 

oss-fuzz/.gitignore

@@ -0,0 +1,3 @@
+fuzz-commit-graph
+fuzz-pack-headers
+fuzz-pack-idx