Position Independent Code (PIC) support in raster renderer.

* src/raster/ftrend1.h declare ft_raster1_renderer_class
and ft_raster5_renderer_class
using macros from ftrender.h,
when FT_CONFIG_OPTION_PIC is defined create and destroy
functions will be declared.
* src/smooth/ftrend1.c when FT_CONFIG_OPTION_PIC is defined
ft_raster1_renderer_class and ft_raster5_renderer_class structs
will have functions to init or create and destroy them
instead of being allocated in the global scope.
Macros will be used from rastpic.h in order to access
ft_standard_raster from the pic_container (allocated in ftraster.c).
In ft_raster1_render when PIC is enabled, the last letter of
module_name is used to verfy the renderer class rather than the
class pointer.

* src/raster/ftraster.c when FT_CONFIG_OPTION_PIC is defined
ft_standard_raster struct will have function to init it
instead of being allocated in the global scope.

New Files:
* src/raster/rastpic.h declare struct to hold PIC globals for raster
renderer and macros to access them.
* src/raster/rastpic.c implement functions to allocate, destroy and
initialize PIC globals for raster renderer.

* src/raster/raster.c add new file to build: rastpic.c.
* src/raster/jamfile add new files to FT2_MULTI build: rastpic.c.
8 files changed