[libpng15] Made a probably general fix for the preprocessing used to generate

source files. This change might make the check for a special C preprocessor
unnecessary, and it also eliminates the requirement for sed in the
configure build process. NOTE: this is incomplete, a change must also
be made to pnglibconf.mak

pngtest.c

@@ -1242,7 +1242,7 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
          memcpy(tIME_string,
                     png_convert_to_rfc1123(read_ptr, mod_time),
                     png_sizeof(tIME_string));
- 
+
          tIME_string[png_sizeof(tIME_string) - 1] = '\0';
          tIME_chunk_present++;
 #endif /* PNG_TIME_RFC1123_SUPPORTED */