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/statfs.c b/statfs.c
index 6373195..3845c2a 100644
--- a/statfs.c
+++ b/statfs.c
@@ -52,8 +52,7 @@
 	tprints("}");
 }
 
-int
-sys_statfs(struct tcb *tcp)
+SYS_FUNC(statfs)
 {
 	if (entering(tcp)) {
 		printpath(tcp, tcp->u_arg[0]);
@@ -64,8 +63,7 @@
 	return 0;
 }
 
-int
-sys_fstatfs(struct tcb *tcp)
+SYS_FUNC(fstatfs)
 {
 	if (entering(tcp)) {
 		printfd(tcp, tcp->u_arg[0]);
@@ -181,16 +179,14 @@
 	return 0;
 }
 
-int
-sys_statfs64(struct tcb *tcp)
+SYS_FUNC(statfs64)
 {
 	if (entering(tcp))
 		printpath(tcp, tcp->u_arg[0]);
 	return do_statfs64_fstatfs64(tcp);
 }
 
-int
-sys_fstatfs64(struct tcb *tcp)
+SYS_FUNC(fstatfs64)
 {
 	if (entering(tcp))
 		printfd(tcp, tcp->u_arg[0]);
@@ -199,8 +195,7 @@
 #endif /* HAVE_STRUCT_STATFS64 */
 
 #ifdef ALPHA
-int
-osf_statfs(struct tcb *tcp)
+SYS_FUNC(osf_statfs)
 {
 	if (entering(tcp)) {
 		printpath(tcp, tcp->u_arg[0]);
@@ -212,8 +207,7 @@
 	return 0;
 }
 
-int
-osf_fstatfs(struct tcb *tcp)
+SYS_FUNC(osf_fstatfs)
 {
 	if (entering(tcp)) {
 		tprintf("%lu, ", tcp->u_arg[0]);