Major infrastructure changes, part 2.

* Moved helpers, common and triggers dirs into xbps-src, where
  they belong.
* Renamed the templates dir to srcpkgs, it was so redundant before.
* Make it possible to add subpkgs with no restriction in names, for
  example udev now has a subpkgs called "libgudev". Previously
  subpkgs were named "${sourcepkg}-${pkgname}".
* xbps-src: changed to look for template files in current directory.
  That means that most arguments from the targets have been removed.
* xbps-src: added a reinstall target, to remove + install.
* xbps-src: do not overwrite binpkgs by default, skip them.

And more that I forgot because it's a mega-commit that I've been
working for some days already...

--HG--
extra : convert_revision : 0f466878584d1e6895d2a234f07ea1b2d1e61b3e

srcpkgs/m4/template

@@ -0,0 +1,19 @@
+# Template build file for 'm4'.
+pkgname=m4
+version=1.4.13
+distfiles="http://ftp.gnu.org/gnu/m4/$pkgname-$version.tar.bz2"
+build_style=gnu_configure
+configure_args="--enable-changeword --enable-threads"
+short_desc="GNU version of UNIX m4 macro language processor"
+maintainer="Juan RP <xtraeme@gmail.com>"
+checksum=fcc6fe95e31476dae0fe17a941603c9876cffd0172c8985787388b99a5caec06
+long_desc="
+    GNU m4 is an implementation of the traditional UNIX macro
+ processor. It is mostly SVR4 compatible, although it has some
+ extensions (for example, handling more than 9 positional parameters to
+ macros). m4 also has builtin functions for including files, running
+ shell commands, doing arithmetic, etc. Autoconf needs GNU m4 for
+ generating configure scripts, but not for running them."
+
+base_chroot=yes
+Add_dependency run glibc