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we need set the $CARCH in the package destination
needs also to be passed over for recursive action

We no require apk-tools-2.1

Conflicts:
	Makefile

apk-tools-2.0's apk index will not show the arch so we need to use
tar to find arch if we have old apk. We prefer use apk index since
it will only read first block of file, regardless size, while tar
will read entire file. Reading entire file is slow if file is big.

So we check apk --version and use tar if needed, and apk index if
possible.

will recursively parse all build depends

This is so apk-tools-2.1 works

we need use "$srcdir"

So SUDO="sudo -E" works for http proxy settings

Currently, if the build server downloads a file that fails the md5sum check
for some reason (perhaps interrupted download, etc), the file is never deleted
so the build can not succeed until someone manually deletes the bad file.  This
change deletes any file that is a remote source file / package that fails the
md5sum check.  The subsequent rebuild will then be forced to download the file
again.

Our build infrastruc needs to handle it

We can either set maintainer="..." in APKBUILD or use it as comment.

This can be useful for package browser.