Also, enable parallel builds because I got sick of waiting :)

The new clang is more strict about signed comparisons against pointers,
so this adds a couple of ad-hoc patches to appease it.

cc @aszlig

PIC is used by default since 16.09

ppsspp: 1.1.0 -> 1.3

Every Rust derivation used to emit a warning like the following:

```
setting SOURCE_DATE_EPOCH to timestamp 1490877042 of file cargo-6e0c18c/Cargo.lock
warning: file cargo-6e0c18c/Cargo.lock may be generated; SOURCE_DATE_EPOCH may be non-deterministic
```

The reason is that the dependencies are copied without preserving
timestamps. Changing the build script to timestamp-preserving copy
removes the warning.

redprl: 2016-09-22 -> 2017-03-28

swift: remove i686-linux from platforms, limit to x86-64-linux

opera: 43.0.2442.991 -> 44.0.2510.857

sylpheed: 3.5.0 -> 3.5.1

pidginsipe: 1.20.0 -> 1.22.0

mate: update packages to version 1.18.0

Automated Emacs package updates

Tried fixing it, but gave up ... Has likely been non-functional for a
while, without anybody noticing.

(cherry picked from commit 961367717662ca84daf01a1f9ee3f9404ae659d0)

Removals:
 - vimgolf - new repo lacks tags