Zabbix

...G...PS. [ZBX-20864] Fixed format specifier definitions on AIX

AIX doesn't export the __WORDSIZE system configuration variable and
instead uses WORD_BIT for this purpose. However, the word size doesn't
change regardless of compiler mode, making WORD_BIT useless for
determining format specifiers for the varying size integers.

When the compiler is invoked in 64 bit mode (-maix64 for gcc, -q64 or
setting OBJECT_MODE=64 for xlc), it defines __64BIT__, which we can use
instead.