build: remove redundant shebang from apk lifecycle scripts

Due to the way apk lifecycle scripts are defined, they might end up with
multiple shebangs. Remove them.

Before:

  post-upgrade: |
    #!/bin/sh
    export PKG_UPGRADE=1
    #!/bin/sh
    [ "${IPKG_NO_SCRIPT}" = "1" ] && exit 0
    [ -s ${IPKG_INSTROOT}/lib/functions.sh ] || exit 0
    . ${IPKG_INSTROOT}/lib/functions.sh
    export root="${IPKG_INSTROOT}"
    export pkgname="adblock-fast"
    add_group_and_user
    default_postinst
    #!/bin/sh
    # check if we are on real system
    if [ -z "${IPKG_INSTROOT}" ]; then
    	/etc/init.d/adblock-fast enable
    fi
    exit 0

After:

  post-upgrade: |
    #!/bin/sh
    export PKG_UPGRADE=1
    [ "${IPKG_NO_SCRIPT}" = "1" ] && exit 0
    [ -s ${IPKG_INSTROOT}/lib/functions.sh ] || exit 0
    . ${IPKG_INSTROOT}/lib/functions.sh
    export root="${IPKG_INSTROOT}"
    export pkgname="adblock-fast"
    add_group_and_user
    default_postinst
    # check if we are on real system
    if [ -z "${IPKG_INSTROOT}" ]; then
    	/etc/init.d/adblock-fast enable
    fi
    exit 0

Fixes: b52e897 ("include/package-pack: remove leading whitespace from install scripts")
Fixes: 03880e2 ("include/package-pack: add missing apk package lifecycle events")
Signed-off-by: George Sapkin <[email protected]>
Link: https://github.com/openwrt/openwrt/pull/21369
Signed-off-by: Robert Marko <[email protected]>

include/package-pack.mk

@@ -505,21 +505,21 @@ else
 		echo 'export pkgname="$(1)$$(ABIV_$(1))"'; \
 		echo "add_group_and_user"; \
 		echo "default_postinst"; \
-		[ ! -f $$(ADIR_$(1))/postinst-pkg ] || sed -z 's/^\s*#!/#!/' "$$(ADIR_$(1))/postinst-pkg"; \
+		[ ! -f $$(ADIR_$(1))/postinst-pkg ] || sed '/^\s*#!/d' "$$(ADIR_$(1))/postinst-pkg"; \
 	) > $$(ADIR_$(1))/post-install;
 
     ifdef Package/$(1)/preinst
 	( \
 		echo "#!/bin/sh"; \
 		echo 'export PKG_UPGRADE=1'; \
-		[ ! -f $$(ADIR_$(1))/preinst ] || sed -z 's/^\s*#!/#!/' "$$(ADIR_$(1))/preinst"; \
+		[ ! -f $$(ADIR_$(1))/preinst ] || sed '/^\s*#!/d' "$$(ADIR_$(1))/preinst"; \
 	) > $$(ADIR_$(1))/pre-upgrade;
     endif
 
 	( \
 		echo "#!/bin/sh"; \
 		echo 'export PKG_UPGRADE=1'; \
-		[ ! -f $$(ADIR_$(1))/post-install ] || sed -z 's/^\s*#!/#!/' "$$(ADIR_$(1))/post-install"; \
+		[ ! -f $$(ADIR_$(1))/post-install ] || sed '/^\s*#!/d' "$$(ADIR_$(1))/post-install"; \
 	) > $$(ADIR_$(1))/post-upgrade;
 
 	( \
@@ -529,7 +529,7 @@ else
 		echo 'export root="$$$${IPKG_INSTROOT}"'; \
 		echo 'export pkgname="$(1)$$(ABIV_$(1))"'; \
 		echo "default_prerm"; \
-		[ ! -f $$(ADIR_$(1))/prerm-pkg ] || sed -z 's/^\s*#!/#!/' "$$(ADIR_$(1))/prerm-pkg"; \
+		[ ! -f $$(ADIR_$(1))/prerm-pkg ] || sed '/^\s*#!/d' "$$(ADIR_$(1))/prerm-pkg"; \
 	) > $$(ADIR_$(1))/pre-deinstall;
 
 	[ ! -f $$(ADIR_$(1))/postrm ] || sed -zi 's/^\s*#!/#!/' "$$(ADIR_$(1))/postrm";