Use portable format specifiers: Case %lld - plain - sprintf.

Fix uses of plain "%lld" within sprintf():
- Replace "%lld" with "%" PRId64.
- Cast corresponding argument to (int64_t).
Use portable format specifiers: Case %lld - localized - sprintf.

Fix uses of localized "%lld" within sprintf():
- Replace _("%lld") with _("%" PRId64).
- Cast corresponding argument to (int64_t).
- In *.po files, replace "%lld" with "%<PRId64>".
Use portable format specifiers: Remove branching with LONG_LONG_OFF_T.

After previous commits, branching code by using macro LONG_LONG_OFF_T
becomes unneccesary. Remove it.
Use portable format specifiers: Case %ld - plain - sprintf.

Fix uses of plain "%ld" within sprintf():
- Replace "%ld" with "%" PRId64.
- Cast corresponding argument to (int64_t).
Use portable format specifiers: Case %ld - localized - sprintf.

Fix uses of localized "%ld" within sprintf():
- Replace "%ld" with "%" PRId64.
- Cast corresponding argument to (int64_t).
Use portable format specifiers: Case %ld - plain - fprintf.

Fix uses of plain "%ld" within fprintf():
- Replace "%ld" with "%" PRId64.
- Cast corresponding argument to (int64_t).
Use portable format specifiers: Case %ld - plain - smsg.

Fix uses of plain "%ld" within smsg():
- Replace "%ld" with "%" PRId64.
- Cast corresponding argument to (int64_t).
Use portable format specifiers: Case %ld - localized - smsg.

Fix uses of localized "%ld" within smsg():
- Replace "%ld" with "%" PRId64.
- Cast corresponding argument to (int64_t).
Use portable format specifiers: Case %ld - plain - vim_snprintf.

Fix uses of plain "%ld" within vim_snprintf():
- Replace "%ld" with "%" PRId64.
- Cast corresponding argument to (int64_t).
Use portable format specifiers: Case %ld - localized - vim_snprintf.

Fix uses of localized "%ld" within vim_snprintf():
- Replace "%ld" with "%" PRId64.
- Cast corresponding argument to (int64_t).
Use portable format specifiers: Case %ld - localized - vim_snprintf_add.

Fix uses of localized "%ld" within vim_snprintf_add():
- Replace "%ld" with "%" PRId64.
- Cast corresponding argument to (int64_t).
Use portable format specifiers: Adapt EMSGN/emsgn to use (int64_t).
Use portable format specifiers: Case %ld - plain - EMSGN.

Fix uses of plain "%ld" within EMSGN():
- Replace "%ld" with "%" PRId64.
- No argument cast needed. EMSGN() will take care of that.
Use portable format specifiers: Case %ld - localized - EMSGN.

Fix uses of localized "%ld" within EMSGN():
- Replace "%ld" with "%" PRId64.
- No argument cast needed. EMSGN() will take care of that.
Use portable format specifiers: Case %ld - localized - N_.

Fix uses of plain "%ld" within N_():
- Replace "%ld" with "%" PRId64.
Use portable format specifiers: Case %ld - *.po files.

Fix uses of plain "%ld" within *.po files:
- Replace "%ld" with "%<PRId64>".
Use portable format specifiers: Support 'll' in vim_snprintf.

Add support for 'll' length specifier in vim_snprintf/vim_vsnprintf.
Use portable format specifiers: Case %l[uoxX] - plain - sprintf.

Fix uses of plain "%lu", "%lo", "%lx" and "%lX" within sprintf():
- Replace "%l<whatever>" with "%" PRI<whatever>64.
- Cast corresponding argument to (uint64_t).
Use portable format specifiers: Case %lu - localized - EMSGN.

Fix uses of plain "%lu" within EMSGN():
- Replace "%lu" with "%" PRIu64.
- No argument cast needed. EMSGN() will take care of that.
Use portable format specifiers: Remove dead code.