Do not explicitly add "-fPIC" to the compiler command line.

Do not explicitly add "-fPIC" to the compiler command line.

There is no need to explicitly add "-fPIC" to the compiler command
line since the SCons SharedLibary builder will automatically add it.
This change also addresses a problem where position independent code
was unnecessarily and incorrectly generated for static libraries.
IoTivity resource related static libraries are now smaller and code is
more efficient as result of removing "-fPIC" from static library
generation since the indirection that accompanies position independent
code no longer exists (for those static libraries).

Change-Id: I6cf57713d97b62f873ded4f4728fbb5e77e28ca6
Signed-off-by: Ossama Othman <ossama.othman@intel.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/399
Reviewed-by: Sashi Penta <sashi.kumar.penta@intel.com>
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>
Reviewed-by: Caiwen Zhang <caiwen.zhang@intel.com>
Reviewed-by: Sudarshan Prasad <sudarshan.prasad@intel.com>