Commit a522213 ("tccpe.c: never assume static...") removed the global
-I$(TOP) for cleaner lib build, and ensured that it is added for
bcheck.c as it now includes config.h, but forgot that bt-exe.c also
needs config.h, as it includes ../tccrun.c which includes it.
Also, the explicit tccrun.c prerequisite for bt-exe.c is not required,
as all *.o lib files depend on $(TCC), which depends on libtcc, which
depends on tccrun.c .
Also, at win32/built-tcc.bat, while bcheck.c needs -I.. for config.h,
bt-exe.c doesn't, as ../tccrun.c does find it where it expects it.
d440ed819c