[devel] Removed recently removed function names from scripts/*.def

and removed the deprecated png_check_sig() function.

scripts/pngos2.def

@@ -11,9 +11,7 @@ DATA		PRELOAD MOVEABLE MULTIPLE
 
 EXPORTS
 
-
   png_build_grayscale_palette
-  png_check_sig
   png_chunk_error
   png_chunk_warning
   png_convert_from_struct_tm
@@ -80,8 +78,6 @@ EXPORTS
   png_get_y_offset_pixels
   png_get_y_pixels_per_meter
   png_malloc
-  png_memcpy_check
-  png_memset_check
   png_process_data
   png_progressive_combine_row
   png_read_end
@@ -106,7 +102,6 @@ EXPORTS
   png_set_compression_strategy
   png_set_compression_window_bits
   png_set_crc_action
-  png_set_dither
   png_set_error_fn
   png_set_expand
   png_set_filler
@@ -201,11 +196,8 @@ EXPORTS
   png_set_add_alpha
 
 ; Added at version 1.2.9
-  png_get_uint_32
   png_save_uint_32
-  png_get_uint_16
   png_save_uint_16
-  png_get_int_32
   png_save_int_32
   png_get_uint_31
   png_set_expand_gray_1_2_4_to_8