[patch] FreeBSD build broken due to missing -lrt

[Bruce Cran <bruce@xxxxxxxxxxx>]

Hi,

The latest fio fails to link on FreeBSD because timer_create is in
librt but the -lrt flag is missing from Makefile.FreeBSD.

I also noticed a couple of compiler warnings when building with clang -
a format of "%Lu" is used but 'L' doesn't have any effect with 'u' - I
guess %llu is needed since the types are 'unsigned long long'?

I've attached patches against git HEAD.

-- 
Bruce Cran

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