add missing dependency on sysimage

pkgimage.mk

@@ -26,12 +26,12 @@ all-debug:   $(addprefix cache-debug-, $(STDLIBS))
 define pkgimg_builder
 $1_SRCS := $$(shell find $$(build_datarootdir)/julia/stdlib/$$(VERSDIR)/$1/src -name \*.jl) \
     $$(wildcard $$(build_prefix)/manifest/$$(VERSDIR)/$1)
-$$(BUILDDIR)/stdlib/$1.release.image: $$($1_SRCS) $$(addsuffix .release.image,$$(addprefix $$(BUILDDIR)/stdlib/,$2))
+$$(BUILDDIR)/stdlib/$1.release.image: $$($1_SRCS) $$(addsuffix .release.image,$$(addprefix $$(BUILDDIR)/stdlib/,$2)) $(build_private_libdir)/sys.$(SHLIB_EXT)
 	@$$(call PRINT_JULIA, $$(call spawn,$$(JULIA_EXECUTABLE)) --startup-file=no --check-bounds=yes -e 'Base.compilecache(Base.identify_package("$1"))')
 	@$$(call PRINT_JULIA, $$(call spawn,$$(JULIA_EXECUTABLE)) --startup-file=no -e 'Base.compilecache(Base.identify_package("$1"))')
 	touch $$@
 cache-release-$1: $$(BUILDDIR)/stdlib/$1.release.image
-$$(BUILDDIR)/stdlib/$1.debug.image: $$($1_SRCS) $$(addsuffix .debug.image,$$(addprefix $$(BUILDDIR)/stdlib/,$2))
+$$(BUILDDIR)/stdlib/$1.debug.image: $$($1_SRCS) $$(addsuffix .debug.image,$$(addprefix $$(BUILDDIR)/stdlib/,$2)) $(build_private_libdir)/sys-debug.$(SHLIB_EXT)
 	@$$(call PRINT_JULIA, $$(call spawn,$$(JULIA_EXECUTABLE)) --startup-file=no --check-bounds=yes -e 'Base.compilecache(Base.identify_package("$1"))')
 	@$$(call PRINT_JULIA, $$(call spawn,$$(JULIA_EXECUTABLE)) --startup-file=no -e 'Base.compilecache(Base.identify_package("$1"))')
 cache-debug-$1: $$(BUILDDIR)/stdlib/$1.debug.image