elf: Fix 64 time_t support for installed statically binaries

The usage of internal static symbol for statically linked binaries
does not work correctly for objects built with -D_TIME_BITS=64,
since the internal definition does not provide the expected aliases.

This patch makes it to use the default stat functions instead (which
uses the default 64 time_t alias and types).

Checked on i686-linux-gnu.