Declare syscall parsers using SYS_FUNC macro

Introduce SYS_FUNC macro to declare and define all syscall parsers.

* Makefile.am (BUILT_SOURCES, CLEANFILES): Add sys_func.h.
(sys_func.h): New rule.
* defs.h (SYS_FUNC_NAME, SYS_FUNC): New macros.
* linux/syscall.h: Include "sys_func.h".
[NEED_UID16_PARSERS]: Use SYS_FUNC to declare uid16 syscall parsers.
Remove other declarations.
* linux/alpha/syscallent.h (160, 161): Add sys_ prefix to osf_statfs
and osf_fstatfs syscall parsers.
* *.c: Use SYS_FUNC to define syscall parsers.
diff --git a/fanotify.c b/fanotify.c
index 63816b8..8ceca0e 100644
--- a/fanotify.c
+++ b/fanotify.c
@@ -10,8 +10,7 @@
 # define FAN_NOFD -1
 #endif
 
-int
-sys_fanotify_init(struct tcb *tcp)
+SYS_FUNC(fanotify_init)
 {
 	unsigned flags;
 
@@ -34,8 +33,7 @@
 #include "xlat/fan_mark_flags.h"
 #include "xlat/fan_event_flags.h"
 
-int
-sys_fanotify_mark(struct tcb *tcp)
+SYS_FUNC(fanotify_mark)
 {
 	unsigned long long mask = 0;
 	int argn;