Move package info pre-processing to jam build system

Also, pre-process all package infos (not only the generic ones) and
define the macro HAIKU_BOOTSTRAP_BUILD, if building a package for a
bootstrap image.

build/scripts/build_haiku_package

@@ -10,7 +10,6 @@ set -o errexit
 # compressionLevel
 # updateOnly
 # cc
-# packagingArch
 #
 # addattr
 # copyattr
@@ -115,16 +114,6 @@ echo "$packageName: mimeset'ing package contents ..."
 $mimeset --mimedb "$mimeDB" "$contentsDir"
 
 
-# create the package-info from a generic package-info if needed
-if [ $(basename $(dirname $packageInfoPath)) = 'generic' ]; then
-	echo "$packageName: Creating real package info from generic one ..."
-	genericPackageInfoPath=$packageInfoPath
-	packageInfoPath=$tmpDir/.PackageInfo
-	cat "$genericPackageInfoPath" \
-		| $cc -E -DHAIKU_PACKAGING_ARCH=$packagingArch - > "$packageInfoPath"
-fi
-
-
 # create the package
 if [ ! $updateOnly ]; then
 	echo "$packageName: Creating the package ..."