Fix fuchsia build; remove sys/syscall.h

Change-Id: I81acfff218ebbfd76c3eaf0e07afd74046b32c21
diff --git a/framework/delibs/dethread/unix/deThreadUnix.c b/framework/delibs/dethread/unix/deThreadUnix.c
index 698d26b..95c6168 100644
--- a/framework/delibs/dethread/unix/deThreadUnix.c
+++ b/framework/delibs/dethread/unix/deThreadUnix.c
@@ -35,7 +35,6 @@
 #include <unistd.h>
 #include <pthread.h>
 #include <sched.h>
-#include <sys/syscall.h>
 
 #if (DE_OS == DE_OS_OSX) || (DE_OS == DE_OS_IOS)
 #	if !defined(_SC_NPROCESSORS_CONF)