we now fail if noarch is set wrong

We check if noarch is properly set

Some .so files have a rpath where to look for the needed .so. When tracing
package dependencies we also have a look there.

This should fix problem when the .so is not in standard location, /usr/lib
or /lib. (for example freeradius plugins)

While here we also reorganize things so we only call apk info --who-owns
once for each package instead of once for each needed .so. This should
speed up things when there are many needed .so files.

- add arch to .PKGINFO
- exit with success if package is not in arch

ap is a helper script to parse APKBUILD and calculate build time
dependencies.

see http://redmine.alpinelinux.org/issues/409

some awk's does not understand -F "\ " and treats that as special space

newapkbuild http://example.com/path/foo-1.0.tar.gz
will set
pkgname=foo
pkgver=1.0
source="http://example.com/path/foo-1.0.tar.gz"

Those are needed when linking to the lib and not during runtime.

Having those in the -dev package makes it easier to allow different
versions of same libs to be installed side-by-side.

based on patch from Andrew Manison. Thanks!