build-vm, stage2: set GLOBAL_HSH_PROC=1

Enable /proc for build vm/<target> and distro/<target> with use/stage2.
/proc needed for make-initrd >= 2.23.0.
See also https://bugzilla.altlinux.org/40900

features.in/build-vm/config.mk

@@ -1,3 +1,4 @@
 # hooked from lib/sugar.mk
 use/build-vm: sub/rootfs@/ use/kernel/initrd-setup
 	@$(call add_feature)
+	@$(call set,GLOBAL_HSH_PROC,1)

features.in/stage2/config.mk

@@ -5,6 +5,7 @@ use/stage2:: sub/stage1
 	@$(call add,STAGE1_MODLISTS,$$(FEATURES))
 	@$(call xport,STAGE1_PACKAGES)
 	@$(call xport,STAGE1_KCONFIG)
+	@$(call set,GLOBAL_HSH_PROC,1)
 
 ifneq (,$(filter-out e2k%,$(ARCH)))
 ifeq (,$(BRANCH))