Add fmtlib_ndk back to the deny list because it fails in mixed builds postsubmit.

But add it to the mixed builds deny list instead of the bp2build deny list.

Test: Waiting for another postsubmit to run.
Change-Id: Ief51356758304b3f13c95df401e310d4f5e236f7
diff --git a/android/bazel.go b/android/bazel.go
index 22d558f..71884a7 100644
--- a/android/bazel.go
+++ b/android/bazel.go
@@ -245,6 +245,7 @@
 		"libsystemproperties",              // cparsons@, cc_library_static, wrong include paths
 		"libpropertyinfoparser",            // cparsons@, cc_library_static, wrong include paths
 		"libarm-optimized-routines-string", // jingwen@, cc_library_static, OK for bp2build but b/186615213 (asflags not handled in  bp2build), version script assignment of 'LIBC' to symbol 'memcmp' failed: symbol not defined (also for memrchr, strnlen)
+		"fmtlib_ndk",                       // http://b/187040371, cc_library_static, OK for bp2build but format-inl.h:11:10: fatal error: 'cassert' file not found for mixed builds
 	}
 
 	// Used for quicker lookups