Remove external/ltrace from the manifest.

I've fixed ltrace, but I've also determined that it now builds out of
the box anyway. Plus no-one complained for the whole year that the makefile
was disabled.

Bug: http://b/19715557
Change-Id: I8b8ef7faaf5f2c4328f7eea056cb0b1e9414758e
1 file changed
tree: c90a9f5d92349ab892a63b242c3b5888703a39f5
  1. default.xml
  2. GLOBAL-PREUPLOAD.cfg