fix reading png files with libpng16

a few patches from Roland Rosenfeld (debian):
Fix problems with creating PS, EPS and PDF
Revert the change of X-Spline parameter made in 3.2.5c.
Fix a hack in arcs and ellipses editing wich does not work with

3.2.5c

fix error with filled objects in new xlib

Don't use local SimpleMenu.c with XAW3D1_5E (closes #26956)
add -DDXAW_INTERNATIONALIZATION for new libXaw3d-1.6.2
f_read.c: delete comments when deleting objects
rebuild with libXaw3d-1.6.2

restore colors and figure comments after delete_all + undo
fix scrollbar on indpanel after mode change
fix some build warnings

fix for libpng15

add xfig.sh wrapper to avoid utf8 charsets
add save8bit appres to allow saving 8-bit symbols without converting
small fix to the previous commit

don't use fontsets for symbols and dingbats fonts (closes #26579)

revert 10pt search tolerance back to 4pt (as in < 3.2.5 )
bugfixes (see git-log for details):
swap depths in undo_load()
don't restore filenames in F_ADD/F_DELETE actions
restore user colors in new_xfig_request()
fix depth handling in undo_join_split()
fix xfontlist->fset initialization

fix errors with help viewer calls
more accurate fix of wrong cur_mode after zooming

3.2.5b

fix xfig.desktop
rebuild with set-versioned libXaw3d

xfig.desktop: add Categories
xfig.spec: remove unsupported Vendor tag

rebuild with new libpng

replace incomplete mkstemp patch from Fedora with one from SUSE (CVE-2009-1962)