library: sysstat and vmstat api changes

Use the standard libc declarations.
For protecting the headers for C++ procps used to have its
own defines, this change makes them use the standard libc ones.

getstat() -> procps_stat_*
vminfo() -> procps_vmstat_*
These two components of the library now use the newer version of
the API with less exposed global variables. The old methods are
there for now.

Signed-off-by: Craig Small <csmall@enc.com.au>

proc/alloc.h

@@ -1,9 +1,9 @@
 #ifndef PROCPS_PROC_ALLOC_H
 #define PROCPS_PROC_ALLOC_H
 
-#include "procps.h"
+#include <proc/procps.h>
 
-EXTERN_C_BEGIN
+__BEGIN_DECLS
 
  /* change xalloc_err_handler to override the default fprintf(stderr... */
 extern message_fn xalloc_err_handler;
@@ -13,6 +13,6 @@ extern void *xmalloc(size_t size) MALLOC;
 extern void *xrealloc(void *oldp, unsigned int size) MALLOC;
 extern char *xstrdup(const char *str) MALLOC;
 
-EXTERN_C_END
+__END_DECLS
 
 #endif