i18n: replace gnu unifont with droid sans font

- Static variables can be initialized with constants only.
- Removed bunifont.ttf.c from datafiles -- it's not actually a
  data file. Unicode font loading stuff is not in blenkernel/font.c
- Allocate as much memory for unzipped data as it's needed.
  Default read chunk is 512Kb.
- Fixed regression (or just a typo) in setting utf locale.
- Default locale set to en_US:en works fine now.
- Commented put Nepali language in user preferences -- it's
  not supported by current droid font and imo it's better to
  have nice font for languages we actually have translation for
  rather than allowing to choose more languages in user preferences.

source/blender/blenlib/BLI_fileops.h

@@ -53,7 +53,7 @@ int   BLI_exists(const char *file);
 int   BLI_copy_fileops(const char *file, const char *to);
 int   BLI_rename(const char *from, const char *to);
 int   BLI_gzip(const char *from, const char *to);
-int   BLI_ungzip_to_mem(const char *from_file, char *to_mem, const int size);
+char *BLI_ungzip_to_mem(const char *from_file, int *size_r);
 int   BLI_delete(const char *file, int dir, int recursive);
 int   BLI_move(const char *file, const char *to);
 int   BLI_touch(const char *file);