Bug 1288984 - Copy X11 include flags for more BSDs. r=glandium

MozReview-Commit-ID: 8Nr3hehjp2v

--HG--
extra : transplant_source : %9E%EB%A4%3E%F9%90t%F6o%AA%A9%BB%40%B6J%0Ai%B8%E4%1A

old-configure.in

@@ -1571,7 +1571,7 @@ dnl Checks for header files.
 dnl ========================================================
 AC_HEADER_DIRENT
 case "$target_os" in
-freebsd*|openbsd*)
+bitrig*|dragonfly*|freebsd*|openbsd*)
 # for stuff like -lXshm
     CPPFLAGS="${CPPFLAGS} ${X_CFLAGS}"
     ;;