Make vim ruby FLAVOR use default ruby version

This makes vim use the default ruby version instead of ruby 1.8.

Briefly tested on amd64 using examples on
http://vimdoc.sourceforge.net/htmldoc/if_ruby.html

All of the following still build:

SUBDIR += vim,gtk2,perl,python,ruby
SUBDIR += vim,gtk2,perl,python3,ruby
SUBDIR += vim,no_x11,perl,python,ruby
SUBDIR += vim,no_x11,perl,python3,ruby

This also changes autoconf to run during pre-configure instead of
post-patch, since I think that is the current recommended place as
it allows you to run make patch, modify configure.ac, and then
run make configure.

OKs?

Thanks,
Jeremy

Index: Makefile
===================================================================
RCS file: /cvs/ports/editors/vim/Makefile,v
retrieving revision 1.161
diff -u -p -r1.161 Makefile
--- Makefile 23 Aug 2017 19:10:56 -0000 1.161
+++ Makefile 27 Aug 2017 23:58:45 -0000
@@ -14,6 +14,8 @@ PKGNAME-lang= vim-lang-$V
P= vim${V:R:S/.//}
CATEGORIES= editors

+REVISION-main= 0
+
HOMEPAGE= http://www.vim.org/

# donation-ware
@@ -91,7 +93,6 @@ ERRORS= "Fatal: You only can select one

.if ${FLAVOR:Mruby}
MODULES+= lang/ruby
-MODRUBY_REV= 1.8
CONFIGURE_ARGS+= --enable-rubyinterp --with-ruby-command=${RUBY}
LIB_DEPENDS+= ${MODRUBY_LIB_DEPENDS}
WANTLIB+= m ${MODRUBY_WANTLIB}
@@ -149,7 +150,7 @@ WRKSRC= ${WRKDIST}/src
SUBST_VARS= P

# CONFIGURE_STYLE=autoconf doesn't work
-post-patch:
+pre-configure:
cd ${WRKSRC}; AUTOCONF_VERSION=${AUTOCONF_VERSION} autoconf

post-configure: