Updated devel/exempi 2.2.2 to 2.3.0
-----------------------------------
2.3.0

- New: API xmp_datetime_compare().
- New: API xmp_string_len() to get the length of the XmpString.
- Bug #94065:
  - New: API xmp_files_can_put_xmp_xmpstring() and xmp_files_can_put_xmp_cstr()
    variants.
  - New: API xmp_files_put_xmp_xmpstring() and xmp_files_put_xmp_cstr()
    variants.
  - New: API xmp_files_get_xmp_xmpstring() variant.
  - Test: check the status of the PDF handler.
- Bug #90380: Fix potential crash with corrupt TIFF file.
- Bug #14612: Better Solaris compilation fix.
- Fix header to pass -Wstrict-prototypes

(mef)