patch 8.2.3770: new compiler warnings from clang-12 and clang-13
Problem: New compiler warnings from clang-12 and clang-13.
Solution: Adjust CI and suppress some warnings. (Ozaki Kiichi, closes #9314)
diff --git a/ci/config.mk.clang-12.sed b/ci/config.mk.clang-12.sed
new file mode 100644
index 0000000..e305c59
--- /dev/null
+++ b/ci/config.mk.clang-12.sed
@@ -0,0 +1,3 @@
+# Clang 12 (or Apple clang 13) and later makes a warning '-Wcompound-token-split-by-macro' enable by default.
+/^PERL_CFLAGS[[:blank:]]*=/s/$/ -Wno-error=compound-token-split-by-macro/
+/^RUBY_CFLAGS[[:blank:]]*=/s/$/ -Wno-error=compound-token-split-by-macro/