Return has_DT_SYMBOLIC flag.

This reverts commit 8f61d991

 Despite the fact that static linker does all the work while linking
 -Bsymbolic executables, according to the SCO doc following DT_SYMBOLIC
 and DF_SYMBOLIC flags is still a requirement for the dynamic linker
 as well.

 (see http://www.sco.com/developers/gabi/2012-12-31/ch5.dynamic.html)

Change-Id: I23f6a5e9b662e40cdbc462b64feff912431e800c