graphics/feh: Update to 3.12.1

Upstream changes since last port update:

v3.12.1

• Update tests to reflect the %f/%F changes implemented in v3.12

v3.12

• Disallow %f and %n format specifiers in --action and --info strings; abort with an error message if those are encountered. Use %F and %N instead. Rationale: %f and %n do not escape shell-specific syntax and are thus a security risk when passing untrusted file names to feh. %F and %N, which have been available since v2.3 (Feb 2012), do escape shell-specific syntax. Migration path: Replace %f (or '%f') and %n (or '%n') with %F and %N (without '') in --action and --info commands.

v3.11.4

• Fix formatting in man page for groff 1.23.0+ (patch by Keith Thompson)
• Do not skip URLs when --sort mtime or similar are used (patch by elig0n)
• Define _GNU_SOURCE macro for mkstemps usage (if enabled) (patch by Jeff Brown)

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