Remove GLOBAL_JAVAC_DEBUG_FLAGS

GLOBAL_JAVAC_DEBUG_FLAGS is no longer set, -g is already included
in the javac command line.  Jack is on its way out, just use -g
directly there for now.

Test: m -j checkbuild
Change-Id: Ib99c248bbb8b65fa2cd2b55449a502fc20deffa8
3 files changed