top: change default allow/suppress define for SIGWINCH

No top #define is enabled and that constitutes default
behavior. So whenever a default behavior should change
the define must be changed too if it is to remain off.

This commit simply changes top's default behavior with
respect to allowing/suppressing any potential flood of
SIGWINCH during resize operations, if running under X.

Formerly top would block those signals to reduce costs
of repeated refreshes. That yields a requirement where
the user would have to provide another keystroke for a
final display update. That keystroke may not always be
needed now, but it ultimately depends on some terminal
emulator's scrollback buffer. In any case, the cost of
re-sizing may go up a bit, under most window managers.

(everything is perfectly justified plus right margins)
(are completely filled, but of course it must be luck)

Reference(s):
commit 4f33b6b8c5
http://www.freelists.org/post/procps/top-won-the-sigwinch-war
http://www.freelists.org/post/procps/top-won-the-sigwinch-war,4
http://www.freelists.org/post/procps/top-won-the-sigwinch-war,5

Signed-off-by: Jim Warner <james.warner@comcast.net>

top/top.h

@@ -24,6 +24,7 @@
 
         /* Defines represented in configure.ac ----------------------------- */
 //#define OOMEM_ENABLE            /* enable the SuSE out-of-memory additions */
+//#define SIGNALS_LESS            /* favor reduced signal load over response */
 
         /* Development/Debugging defines ----------------------------------- */
 //#define ATEOJ_RPTHSH            /* report on hash specifics, at end-of-job */
@@ -39,7 +40,6 @@
 //#define NOBOOST_MEMS            /* disable extra precision for mem fields  */
 //#define NOBOOST_PCNT            /* disable extra precision for % fields    */
 //#define OFF_HST_HASH            /* use BOTH qsort+bsrch vs. hashing scheme */
-//#define OFF_SIGWINCH            /* favor response over reduced signal load */
 //#define OFF_STDIOLBF            /* disable our own stdout _IOFBF override  */
 //#define PRETEND2_5_X            /* pretend we're linux 2.5.x (for IO-wait) */
 //#define PRETEND4CPUS            /* pretend we're smp with 4 ticsers (sic)  */