clover: Add missing include to compat header

Fixes build failure with LLVM 4

Fixes: a981e68c26dc4079a335101da0033185030207f6
	(clover: Fix build against clang SVN >= r299965)

Signed-off-by: Jan Vesely <jan.vesely@rutgers.edu>
Reviewed-by: Francisco Jerez <currojerez@riseup.net>
1 file changed