Merge pull request open-mpi#5071 from bwbarrett/v3.1.x-VERSION

dist: Update version to 3.1.0rc5

Author: bwbarrett

VERSION

@@ -26,7 +26,7 @@ release=0
 # requirement is that it must be entirely printable ASCII characters
 # and have no white space.
 
-greek=rc4
+greek=rc5
 
 # If repo_rev is empty, then the repository version number will be
 # obtained during "make dist" via the "git describe --tags --always"