sign_target_files_apks: rewrite build.prop correctly in eng builds

In eng builds, ro.display.id has many space separated items and was
resulting in an error when trying to rewrite it as 'value' gets
turned into a list and never converted back to a string.

Change-Id: I6c8633ed2eb52c56a4097992a32d53d80df4f844
Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>

Conflicts:
	tools/releasetools/sign_target_files_apks
Enable NX protections

Add -Wa,--noexecstack and -Wl,-z,noexecstack as default
flags when compiling host-side applications.  This enables
NX protections, which prevent code from executing on the
stack or heap.  NX protections make exploiting memory
corruption issues more challenging and is an important
security feature.

Change-Id: Iae580abe887e01f9029ec2a4e0fc0aae496724a4
Fix regex for finding symbol data.

The new output of debuggerd removed a space between the #00 and the rest
of the line. The regex is very restrictive, so fixing it to handle the new
output.

Change-Id: I5259ae1e56a351608b330dfd858a2021e6d89358