[interchange] Add feature to tag/use the current development version for `make tardist`

commit df69a4ad673e79e0476c59a8a2390d7766c18f1a
Author: David Christensen <[email protected]>
Date:   Thu Nov 2 15:05:29 2017 -0500

    Add feature to tag/use the current development version for `make tardist`

 .gitignore  |    1 +
 MANIFEST    |    1 +
 Makefile.PL |    3 ++-
 3 files changed, 4 insertions(+), 1 deletions(-)
---
diff --git a/.gitignore b/.gitignore
index 6ac77aa..63da7fd 100644
--- a/.gitignore
+++ b/.gitignore
@@ -66,3 +66,4 @@ scripts/update
 Vagrantfile
 *.swp
 *~
+.ic-version
diff --git a/MANIFEST b/MANIFEST
index 083abfa..8f5f551 100644
--- a/MANIFEST
+++ b/MANIFEST
@@ -1291,3 +1291,4 @@ t/interchange-test/variable.txt
 test.pl
 UPGRADE
 WHATSNEW
+.ic-version
diff --git a/Makefile.PL b/Makefile.PL
index 54973cd..0e6272e 100644
--- a/Makefile.PL
+++ b/Makefile.PL
@@ -29,7 +29,7 @@ my @mods_to_get;
 my @remove_old;
 my $Lock_troubles;
 
-$VERSION = '5.12.0';
+$VERSION = eval { require './.ic-version' } || '5.12.0';
 
 my @os_hints;
 eval {
@@ -711,6 +711,7 @@ EOF
 	if (-d "./.git") {
 		$X{VERSION} = qx(git describe --tags --dirty);
 		chomp $X{VERSION};
+		system(qq{echo '"$X{VERSION}"' > .ic-version});
 	}
 	else {
 		$X{VERSION} = $VERSION;