[build] no_custom_libcxx on gcc bots

Bug: chromium:1298421
Change-Id: I3489b2ce8b11052cdf7c23d89255b30258cc9157
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3471555Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Nico Hartmann <nicohartmann@chromium.org>
Auto-Submit: Nico Hartmann <nicohartmann@chromium.org>
Cr-Commit-Position: refs/heads/main@{#79149}

infra/mb/mb_config.pyl

@@ -573,7 +573,8 @@
     'debug_x64_fuchsia': [
       'debug_bot', 'x64', 'fuchsia'],
     'debug_x64_gcc': [
-      'debug_bot_no_goma', 'x64', 'gcc', 'lld', 'v8_check_header_includes'],
+      'debug_bot_no_goma', 'x64', 'gcc', 'lld', 'no_custom_libcxx',
+      'v8_check_header_includes'],
     'debug_x64_header_includes': [
       'debug_bot', 'x64', 'v8_check_header_includes'],
     'debug_x64_heap_sandbox': [
@@ -618,10 +619,11 @@
       'release_bot', 'x86', 'asan', 'lsan', 'symbolized',
       'v8_verify_heap'],
     'release_x86_gcc': [
-      'release_bot_no_goma', 'x86', 'gcc', 'lld', 'v8_check_header_includes'],
-    'release_x86_gcc_minimal_symbols': [
-      'release_bot_no_goma', 'x86', 'gcc', 'lld', 'minimal_symbols',
+      'release_bot_no_goma', 'x86', 'gcc', 'lld', 'no_custom_libcxx',
       'v8_check_header_includes'],
+    'release_x86_gcc_minimal_symbols': [
+      'release_bot_no_goma', 'x86', 'gcc', 'lld', 'no_custom_libcxx',
+      'minimal_symbols', 'v8_check_header_includes'],
     'release_x86_gcmole': [
       'release_bot', 'x86', 'gcmole'],
     'release_x86_gcmole_trybot': [