Cleanup: remove no longer needed prepare hooks

- tzdata

   Since the source code is copied over anyway, there is no need
   to patch it up in a previous step. We can do that in the build
   function instead.

 - shadow

   The hooks was used to remove "groups" from the installed
   binaries. This is no longer needed. Instead, simply don't
   package it.

Signed-off-by: David Oberhollenzer <goliath@infraroot.at>

pkg/shadow/build

@@ -5,10 +5,6 @@ URL="https://github.com/shadow-maint/shadow/releases/download/${VERSION}"
 SHA256SUM="a3ad4630bdc41372f02a647278a8c3514844295d36eefe68ece6c3a641c1ae62"
 DEPENDS="toolchain"
 
-prepare() {
-	sed -i 's/groups$(EXEEXT) //' src/Makefile.in
-}
-
 build() {
 	run_configure "$1" --disable-man --without-libpam --without-selinux \
 		     --with-sha-crypt --with-group-name-max-length=32

pkg/tzdata/build

@@ -6,12 +6,9 @@ SHA256SUM="bb2373338140c3de7251e548526f1f70cb742739a962aad3f10238343a2c674c"
 DEPENDS="toolchain"
 SUBPKG="tzdata tzdata-dev"
 
-prepare() {
-	sed -i 's/sbin/bin/g' Makefile
-}
-
 build() {
 	cp -r ${1}/* ${PKGBUILDDIR}
+	sed -i 's/sbin/bin/g' Makefile
 	make -j $NUMJOBS
 }