ALLJOYN-2143 Don't add any debug symbols to the release build

The debug symbols were added to both the release and debug build.  The release
build was not supposed to put any symbols in resulting binaries the debug
information was only supposed to be in the pdb file.  Which could be striped
out of the build. Tests showed it was not as easy to strip out as expected and
was causing the release build of code to be significantly larger than expected.

Change-Id: I3db5a75e64b2729e94216243e1e492b1163a22e4
ALLJOYN-2147 Add debug symbols to the obj files not separate pdb files

With a modern Microsoft compiler it is typical to use a pdb file i.e. the /Zi
or/ZI flags.  However, in SCons a pdb file is created for each .obj file.
To be able to use the debug information we would have to copy all of the
pdb files (one for each C++ file) into the dist. SCons documentation recommends
using the /Z7 option to solve this problem.  Since another more acceptable
solution has not yet been found we are going with the recommendation from the
SCons documentation.

Change-Id: Ib4aebc1da8134568b64216f31eae231509e4062a