make autogenerated functions to be 'static inline' instead of 'inline'
This fixes link issue and compile warning, for more details about this
issue look at
https://bitbucket.org/mjsousa/matiec/issues/53/c-compiler-warning-if-iec-function-is-used
include ../common.mkSUBDIRS = generate_c generate_iecCLEANFILES = stage4.o