* cygheap.h (init_cygheap::_gtod): New hires_ms element.

* hires.h (hires_ms::minperiod): Remove static designation.
(hires::began_period): New field.
* signal.cc: Include headers required for cygheap.h now that gtod lives in the
cygheap.
* timer.c: Ditto.
* times.cc (gtod): Delete variable.
(gtod::minperiod): Ditto.
(gtod::began_period): Define.
(hires_ms::prime): Add more debugging output.  Call timeBeginPeriod only when
!began_period.

winsup/cygwin/signal.cc

@@ -21,6 +21,10 @@ details. */
 #include "hires.h"
 #include "security.h"
 #include "cygtls.h"
+#include "path.h"
+#include "fhandler.h"
+#include "dtable.h"
+#include "cygheap.h"
 
 int sigcatchers;	/* FIXME: Not thread safe. */