Ruby 2.7.0-preview1

This is not intended for commit, but if anyone wants to play around with
the first preview release of Ruby 2.7.0, you can use the attached
tarball. Release announcment at:
https://www.ruby-lang.org/en/news/2019/05/30/ruby-2-7-0-preview1-released/

Below is a ruby.port.mk diff in case you want to build ruby27-* packages
for ruby gem ports.

Thanks,
Jeremy

Index: lang/ruby/ruby.port.mk
===================================================================
RCS file: /cvs/ports/lang/ruby/ruby.port.mk,v
retrieving revision 1.97
diff -u -p -r1.97 ruby.port.mk
--- lang/ruby/ruby.port.mk 29 Apr 2019 00:35:58 -0000 1.97
+++ lang/ruby/ruby.port.mk 31 May 2019 18:47:05 -0000
@@ -24,7 +24,7 @@ MODRUBY_HANDLE_FLAVORS ?= No
# If ruby.pork.mk should handle FLAVORs, define a separate FLAVOR
# for each ruby interpreter
. if !defined(FLAVORS)
-FLAVORS= ruby24 ruby25 ruby26
+FLAVORS= ruby24 ruby25 ruby26 ruby27
. if !${CONFIGURE_STYLE:L:Mext}
FLAVORS+= jruby
. endif
@@ -52,12 +52,13 @@ FLAVOR = ruby26

# Check for conflicting FLAVORs and set MODRUBY_REV appropriately based
# on the FLAVOR.
-. for i in ruby24 ruby25 ruby26 jruby
+. for i in ruby24 ruby25 ruby26 ruby27 jruby
. if ${FLAVOR:M$i}
MODRUBY_REV = ${i:C/ruby([0-9])/\1./}
. if ${FLAVOR:N$i:Mruby24} || \
${FLAVOR:N$i:Mruby25} || \
${FLAVOR:N$i:Mruby26} || \
+ ${FLAVOR:N$i:Mruby27} || \
${FLAVOR:N$i:Mjruby}
ERRORS += "Fatal: Conflicting flavors used: ${FLAVOR}"
. endif