lib/portage/package/ebuild/doebuild.py: use 'eerror' for blank PROVIDES message

This means that it's much harder to miss the error.

Bug: https://bugs.gentoo.org/811462
Reported-by: Brian Dolbec <dolsen@gentoo.org>
Thanks-to: Arfrever Frehtes Taifersar Arahesis <Arfrever@Apache.Org>
Signed-off-by: Sam James <sam@gentoo.org>
diff --git a/lib/portage/package/ebuild/doebuild.py b/lib/portage/package/ebuild/doebuild.py
index 0ff64e2..ac627f5 100644
--- a/lib/portage/package/ebuild/doebuild.py
+++ b/lib/portage/package/ebuild/doebuild.py
@@ -3096,13 +3096,11 @@
             f.write(soname_deps.provides)
     else:
         if check_dyn_libs_inconsistent(image_dir, soname_deps.provides):
-            portage.util._writemsg_level(
-                colorize(
-                    "BAD",
-                    "!!! Error! Installing dynamic libraries (.so) with blank PROVIDES!",
-                ),
-                noiselevel=-1,
-                level=logging.ERROR,
+            eerror(
+                "Error! Installing dynamic libraries (.so) with blank PROVIDES!",
+                phase="install",
+                key=mysettings.mycpv,
+                out=out,
             )
 
     if unrecognized_elf_files: