Disable various unused libxml features: catalogs, DocBook, legacy APIs, etc.

testing/libfuzzer/fuzzers/BUILD.gn

Index: testing/libfuzzer/fuzzers/BUILD.gn
diff --git a/testing/libfuzzer/fuzzers/BUILD.gn b/testing/libfuzzer/fuzzers/BUILD.gn
index 217e08b5a826a3115b20092ab49c1188ad89cd0a..d0d323e82a48d16d5a5e8ead92f2bc665be16809 100644
--- a/testing/libfuzzer/fuzzers/BUILD.gn
+++ b/testing/libfuzzer/fuzzers/BUILD.gn
@@ -353,17 +353,6 @@ fuzzer_test("v8_wasm_types_section_fuzzer") {
   libfuzzer_options = [ "max_len=500" ]
 }
 
-fuzzer_test("libxml_xml_regexp_compile_fuzzer") {
-  sources = [
-    "libxml_xml_regexp_compile_fuzzer.cc",
-  ]
-  deps = [
-    "//third_party/libxml",
-  ]
-  libfuzzer_options = [ "max_len=32" ]
-  additional_configs = [ "//testing/libfuzzer:no_clusterfuzz" ]
-}
-
 fuzzer_test("convert_woff2ttf_fuzzer") {
   sources = [
     "convert_woff2ttf_fuzzer.cc",