build: use compiled files for all stages

Compiled files load much faster, in the end, generally saving the extra
time needed to generate them. This appears to make the last stage in the
build about a minute faster.

Author: vtjnash

sysimage.mk

@@ -107,7 +107,7 @@ $$(build_private_libdir)/sysbase$1-o.a $$(build_private_libdir)/sysbase$1-bc.a :
 		false; \
 	fi )
 	@mv $$@.tmp $$@
-$$(build_private_libdir)/sys$1-o.a $$(build_private_libdir)/sys$1-bc.a : $$(build_private_libdir)/sys$1-%.a : $$(build_private_libdir)/sysbase$1.ji $$(JULIAHOME)/contrib/generate_precompile.jl
+$$(build_private_libdir)/sys$1-o.a $$(build_private_libdir)/sys$1-bc.a : $$(build_private_libdir)/sys$1-%.a : $$(build_private_libdir)/sysbase$1.so $$(JULIAHOME)/contrib/generate_precompile.jl
 	@$$(call PRINT_JULIA, cd $$(JULIAHOME)/base && \
 	if ! JULIA_BINDIR=$$(call cygpath_w,$(build_bindir)) \
 		 WINEPATH="$$(call cygpath_w,$$(build_bindir));$$$$WINEPATH" \