gitea: fix build because of multiple Go packages in the same directory (

google#9350)

The repo has a file named `external_renderer.go`, which belongs to the
`main` package and is located in the same directory as the fuzz tests,
which belong to the `fuzz` package. This causes a build failure, and no
fuzzers can be built.

projects/gitea/build.sh

@@ -15,5 +15,10 @@
 #
 ################################################################################
 
+# external_renderer.go belongs to the main package and is located in the same directory
+# as the fuzz tests which belong to the fuzz package. This causes a build failure and
+# no fuzzers can be built.
+rm -f $SRC/gitea/tools/external_renderer.go
+
 compile_go_fuzzer code.gitea.io/gitea/tools FuzzMarkdownRenderRaw fuzz_markdown_render_raw gofuzz
 compile_go_fuzzer code.gitea.io/gitea/tools FuzzMarkupPostProcess fuzz_markup_post_process gofuzz