sysutils/whowatch: fix build with llvm22

Fix a type error in a configure snippet that broke with LLVM 22.
While here, sync up some prototypes to eliminate a slew of warnings.

sysutils/whowatch/patches/patch-configure_in

@@ -0,0 +1,12 @@
+Index: configure.in
+--- configure.in.orig
++++ configure.in
+@@ -103,7 +103,7 @@ AC_TRY_COMPILE([#include <sys/types.h>
+ #include <sys/sysctl.h>],
+ [
+ int mib[]={CTL_KERN,KERN_PROC,KERN_PROC_PID,1};
+-int len;
++size_t len;
+ sysctl(mib, 4, 0, &len, 0, 0);
+ ],
+ [AC_MSG_RESULT(yes); AC_DEFINE(HAVE_PROCESS_SYSCTL)],

sysutils/whowatch/patches/patch-proctree_h

@@ -0,0 +1,11 @@
+Index: proctree.h
+--- proctree.h.orig
++++ proctree.h
+@@ -18,7 +18,6 @@ struct proc_t {
+ };
+ 
+ int update_tree(void del(void*));
+-int update_tree();
+ struct proc_t* find_by_pid(int pid);
+ struct proc_t* tree_start(int root, int start);
+ struct proc_t* tree_next();

sysutils/whowatch/patches/patch-whowatch_h

@@ -0,0 +1,16 @@
+Index: whowatch.h
+--- whowatch.h.orig
++++ whowatch.h
+@@ -132,10 +132,10 @@ void page_up(struct window *, void (*)());
+ void key_home(struct window *, void (*)());
+ void key_end(struct window *, void (*)());
+ void update_load(void);
+-void updatescr();
++void updatescr(struct window *w);
+ 
+ /* proctree.c */
+-int update_tree();
++int update_tree(void del(void*));
+ void get_rows_cols(int *, int *);
+ 
+ /* procinfo.c */