[build] Provide an option to disable tinfo linking.

In some cases, tinfo is not required to build but the library still gets
linked in because it's present on the system. There should be an
explicit way to disable linking with tinfo.

configure.ac

@@ -88,7 +88,23 @@ AC_SEARCH_LIBS(dlopen, dl)
 AC_SEARCH_LIBS(backtrace, execinfo)
 
 # Sometimes, curses depends on these libraries being linked in...
-AC_SEARCH_LIBS(cur_term, tinfo)
+AC_ARG_ENABLE([tinfo],
+    AS_HELP_STRING([--disable-tinfo],
+        [Disable linking with tinfo, enabled by default]),
+    [], [enable_tinfo="yes"]
+)
+
+AS_IF([test "x${enable_tinfo}" != "xno"],
+    [dnl
+    AC_MSG_NOTICE([Trying to link with tinfo])
+    AC_SEARCH_LIBS(cur_term, tinfo,
+        AC_MSG_NOTICE([Linking with tinfo]),
+        AC_MSG_WARN([libtinfo not found])
+    )
+    ],
+    AC_MSG_NOTICE([Linking with tinfo disabled])
+)
+
 AC_SEARCH_LIBS(Gpm_Open, gpm)
 
 AC_CHECK_HEADERS(execinfo.h pty.h util.h zlib.h bzlib.h libutil.h sys/ttydefaults.h)