all: make buildable again for new 'misc.h' header file

With the 4 header files removed in the previous patch,
this commit just changes all those obsolete references
to that new consolidated 'misc.h' header file instead.

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

proc/uptime.c

@@ -31,8 +31,7 @@
 #include <unistd.h>
 #include <utmp.h>
 
-#include <proc/uptime.h>
-#include <proc/sysinfo.h>
+#include <proc/misc.h>
 #include "procps-private.h"
 
 #define UPTIME_FILE "/proc/uptime"