Remove unneccessarry prepare() hooks

- Packages that don't download anything don't need a prepare() hook
 - Packages that inherit the source from other packages should leave
   it untouched. If they get downloaded first, they should use the
   hook from the original package.

Signed-off-by: David Oberhollenzer <david.oberhollenzer@tele2.at>

pkg/boot-rpi3/build

@@ -1,10 +1,6 @@
 # inherit package details from kernel package
 source "$SCRIPTDIR/pkg/firmware-rpi3/build"
 
-prepare() {
-	return
-}
-
 build() {
 	return
 }

pkg/initrd/build

@@ -62,10 +62,6 @@ dir_filelist() {
 	fi
 }
 
-prepare() {
-	return
-}
-
 build() {
 	local INPUT="$1"
 	local OUTPUT="$2"

pkg/linux_modules/build

@@ -1,10 +1,6 @@
 # inherit package details from kernel package
 source "$SCRIPTDIR/pkg/$LINUXPKG/build"
 
-prepare() {
-	return
-}
-
 build() {
 	local INPUT="$1"
 	local OUTPUT="$2"

pkg/rootfs-alix/build

@@ -1,7 +1,3 @@
-prepare() {
-	return
-}
-
 build() {
 	local SOURCE="$1"
 	local BUILD="$2"

pkg/rootfs-rpi3/build

@@ -1,7 +1,3 @@
-prepare() {
-	return
-}
-
 build() {
 	local SOURCE="$1"
 	local BUILD="$2"

tcpkg/gcc2/build

@@ -1,10 +1,6 @@
 # inherit package details from first stage GCC
 source "$SCRIPTDIR/tcpkg/gcc1/build"
 
-prepare() {
-	return
-}
-
 build() {
 	local INPUT="$1"
 	local OUTPUT="$2"

tcpkg/libgcc/build

@@ -1,7 +1,3 @@
-prepare() {
-	return
-}
-
 build() {
 	return
 }

tcpkg/linux_hdr/build

@@ -1,10 +1,6 @@
 # inherit package details from kernel package
 source "$SCRIPTDIR/pkg/$LINUXPKG/build"
 
-prepare() {
-	return
-}
-
 build() {
 	local INPUT="$1"
 	local OUTPUT="$2"

tcpkg/toolchain/build

@@ -1,7 +1,3 @@
-prepare() {
-	return
-}
-
 build() {
 	return
 }