GNU M4 now built as a dependency of GNU Libtool

On some systems, M4 isn't available, so the linking to the host system
fails, as a result, we can't build GNU Libtool.

The main reason we weren't building M4 was a bug with the most recent GNU C
library
(http://lists.gnu.org/archive/html/bug-gnulib/2019-04/msg00004.html). But I
found a patch used by Arch Linux which fixes the issue and allows M4 to be
built. As a result, the pipeline is now building M4 also and the patched M4
tarball is now uploaded to my own webpage as backup.

While doing the steps above, I also noticed that we weren't using a tab at
the start of the link definitions of `dependencies-basic.mk'. Although its
not necessary, to be consistent, its good for the lines to always start
with a tab.

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