Hide false memleaks in a debugbuild

This makes sure valgrind doesn't show false memleaks that are caused by ncurses
instead of our code when we do a 'Debug' build. There is a also a disadvantage:
When your ncurses library is not build with the '--disable-leaks' option (this
is the case in the default version of ncurses of most distro's) and you build
conky with ncurses and debug turned on then you will see a segmentation fault
when you stop conky. On the other hand people that want to build conky as a
debug build with ncurses support will probably also have a ncurses with
--disable-leaks ...

src/conky.cc

@@ -66,6 +66,9 @@
 #include <getopt.h>
 #ifdef BUILD_NCURSES
 #include <ncurses.h>
+#ifdef DEBUG
+#include "nc.h"
+#endif
 #endif
 #ifdef BUILD_WEATHER_XOAP
 #include <libxml/parser.h>
@@ -4341,6 +4344,9 @@ int main(int argc, char **argv)
 	kvm_close(kd);
 #endif
 
+#if defined(BUILD_NCURSES) && defined(DEBUG)
+	_nc_free_and_exit(0);	//hide false memleaks
+#endif
 	return 0;
 
 }

src/nc.h

@@ -0,0 +1,11 @@
+/* -*- mode: c; c-basic-offset: 4; tab-width: 4; indent-tabs-mode: t -*- */
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+void _nc_free_and_exit(int);
+
+#ifdef __cplusplus
+}
+#endif