Improve handling of bundled ICU components

gn.spec

@@ -70,6 +70,19 @@ Provides:       vim-gn = %{version}-%{release}
 Requires:       emacs-filesystem >= %{_emacs_version}
 Provides:       emacs-gn = %{version}-%{release}
 
+# src/base/third_party/icu/icu_utf.h:
+#
+#   This file has the relevant components from ICU copied to handle basic
+#   UTF8/16/32 conversions. Components are copied from umachine.h, utf.h,
+#   utf8.h, and utf16.h into icu_utf.h.
+#
+# The forked, bundled ICU components are copied from Chromium. Because of the
+# downstream changes (primarily, changing namespaces and symbol prefixes),
+# there is no clear path to unbundling.
+#
+# See src/base/third_party/icu/README.chromium, from which the version number
+# is taken.
+Provides:       bundled(icu) = 60
 
 %description
 GN is a meta-build system that generates build files for Ninja.
@@ -171,7 +184,7 @@ grep -E '^#define[[:blank:]]+LAST_COMMIT_POSITION[[:blank:]]+'\
 
 
 %files doc
-%license LICENSE
+%license LICENSE src/base/third_party/icu/README.chromium
 %doc AUTHORS
 %doc OWNERS
 %doc README*.md