Merge branch 'lazy-reproducible-builds'

We have "lazy reproducible builds" now. What I mean by that is, that
the resulting "apk" archive is not fully reproducible, but all binaries
inside it are. This is necessary to kick-off the binary repo, which is
in turn required to get the testsuite going on Travis. Read #64 for more
information.

Usage:
```
pmbootstrap build hello-world --buildinfo
pmbootstrap challenge /tmp/path/to/hello-world-1-r2.apk
```

The "--buildinfo" parameter generates a "buildinfo.json", which contains
the versions of all dependencies. It is not very optimizied, so this
is a performance bottleneck and takes 10 seconds (which is quite much
considering that the hello-world package builds in less than a second).
This can be improved in the future, and then the buildinfo parameter
may become the default.

binutils-armhf/APKBUILD

@@ -44,6 +44,7 @@ build() {
             --enable-ld=default \
             --enable-gold=yes \
             --enable-plugins \
+            --enable-deterministic-archives \
             --disable-multilib \
             --disable-werror \
             --disable-nls \