[openwrt/openwrt] include/rootfs.mk: do not remove opkg prerm scripts during rootfs preparation

[LEDE Commits]

neoraider pushed a commit to openwrt/openwrt.git, branch lede-17.01:
https://git.lede-project.org/696c6325a3a70b8160d064473bd12421cc4da186

commit 696c6325a3a70b8160d064473bd12421cc4da186
Author: Matthias Schiffer <mschiffer at universe-factory.net>
AuthorDate: Tue Mar 6 08:49:14 2018 +0100

    include/rootfs.mk: do not remove opkg prerm scripts during rootfs preparation
    
    When a user removes a preinstalled opkg package, the package's prerm script
    (and in particular our default_prerm) should run.
    
    Signed-off-by: Matthias Schiffer <mschiffer at universe-factory.net>
---
 include/rootfs.mk | 1 -
 1 file changed, 1 deletion(-)

diff --git a/include/rootfs.mk b/include/rootfs.mk
index c014b1d..dc400a0 100644
--- a/include/rootfs.mk
+++ b/include/rootfs.mk
@@ -82,7 +82,6 @@ define prepare_rootfs
 	@-find $(1) -name '.#*' | $(XARGS) rm -f
 	rm -f $(1)/usr/lib/opkg/lists/*
 	rm -f $(1)/usr/lib/opkg/info/*.postinst*
-	rm -f $(1)/usr/lib/opkg/info/*.prerm*
 	$(call clean_ipkg,$(1))
 	$(call mklibs,$(1))
 endef