patch 8.2.0828: Travis: regexp patttern doesn't work everywhere
Problem: Travis: regexp patttern doesn't work everywhere.
Solution: Use [:blank:] instead of \b. (Ozaki Kiichi, closes #6146)
diff --git a/ci/config.mk.clang.sed b/ci/config.mk.clang.sed
index 40c6705..da6044d 100644
--- a/ci/config.mk.clang.sed
+++ b/ci/config.mk.clang.sed
@@ -1 +1,2 @@
-/^RUBY_CFLAGS\b/s/$/ -Wno-error=unknown-attributes -Wno-error=ignored-attributes/
+/^CFLAGS[[:blank:]]*=/s/$/ -Wno-error=missing-field-initializers/
+/^RUBY_CFLAGS[[:blank:]]*=/s/$/ -Wno-error=unknown-attributes -Wno-error=ignored-attributes/