!include keeps searching include dirs even after match

!include doesn't stop searching the include directories
after it find a match (or more than one match, if
wildcards were used) in one directory.

For example, this will include MUI.nsh twice:

!addincludedir "${NSISDIR}\Include\"
!include MUI.nsh

Original report can be found at:

http://forums.winamp.com/showthread.php?s=&threadid=239588