dmalloc: fix parallel build

Should hopefully fix:

  http://autobuild.buildroot.net/results/2cc40ae3fc8b7a287c43528b3e4ffdbcd5033c09/



[Thomas:
 - Rename patch to the new naming convention.
 - Add SoB line from Alex inside the patch itself.
 - Adjust the commit log to contain the reference to the autobuilder
   failure.]

Signed-off-by: Alex Suykov <alex.suykov@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>