Makefile: Move "-lrt" from LDFLAGS to EXTRA_LIBS
Makefile: Move "-lrt" from LDFLAGS to EXTRA_LIBS

Move "-lrt" from LDFLAGS to EXTRA_LIBS to fix link breakage with GCC.

Signed-off-by: Pekka Enberg <add4fcd06328a394f0ad91feda7ee057316dc5ed@kernel.org>

penberg/libtrading,fengzhyuan/libtrading,Bitcoinsulting/libtrading,jvirtanen/libtrading,divaykin/libtrading,svdev/libtrading,libtrading/libtrading,NunoEdgarGub1/libtrading,etoestja/libtrading,etoestja/libtrading,mstanichenko/libtrading,femtotrader/libtrading,mstanichenko/libtrading,penberg/libtrading,libtrading/libtrading,fengzhyuan/libtrading,svdev/libtrading,jvirtanen/libtrading,Bitcoinsulting/libtrading,divaykin/libtrading,NunoEdgarGub1/libtrading,femtotrader/libtrading