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/version.h

@@ -23,9 +23,9 @@
 #ifndef PROC_VERSION_H
 #define PROC_VERSION_H
 
-#ifdef __cplusplus
-extern "C" {
-#endif
+#include <proc/procps.h>
+
+__BEGIN_DECLS
 
 int procps_linux_version(void);
 
@@ -35,8 +35,6 @@ int procps_linux_version(void);
 #define LINUX_VERSION_MINOR(x) (((x)>> 8) & 0xFF)
 #define LINUX_VERSION_PATCH(x) ( (x)      & 0xFF)
 
-#ifdef __cplusplus
-} /* extern "C" */
-#endif
+__END_DECLS
 
 #endif	/* PROC_VERSION_H */