+20120616
+ + add configure check to distinguish clang from gcc to eliminate
+ warnings about unused command-line parameters when compiler warnings
+ are enabled.
+ + improve behavior when updating terminfo entries which are hardlinked
+ by allowing for the possibility that an alias has been repurposed to
+ a new primary name.
+ + fix some strict compiler warnings based on package scripts.
+ + further fixes for configure check for working poll (Debian #676461).
+