[automerger skipped] Declare dlmalloc as a cc_library_headers am: 6d7299810b am: 1ae0a0aedd am: d0c75b05e5 am: 4b86cf1246 am: a46e67742a -s ours

am skip reason: Merged-In Ic6f84404a27b0ad93e161e6bd080331d0c6d6439 with SHA-1 b6c3470602 is already in history

Original change: https://android-review.googlesource.com/c/platform/external/dlmalloc/+/2139492

Change-Id: I89135d0ba76a8570f90756e292731dadf059546a
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>