library: eliminate inappropriate '__BEGIN_DECLS' macro

This patch simply eliminates that glibc specific macro
from all header files which contain no public callable
functions. After all, if user code can't link to them,
then protection from C++ name mangling is unnecessary.

[ we also remove any related '#include <features.h>' ]

Signed-off-by: Jim Warner <james.warner@comcast.net>

include/signals.h

@@ -11,8 +11,6 @@
  * GNU Library General Public License for more details.
  */
 
-__BEGIN_DECLS
-
 extern const int number_of_signals;
 
 extern const char *get_sigtable_name(int row);
@@ -32,5 +30,4 @@ extern void pretty_print_signals(void);
 
 extern void unix_print_signals(void);
 
-__END_DECLS
 #endif

proc/devname.h

@@ -1,15 +1,10 @@
 #ifndef PROC_DEVNAME_H
 #define PROC_DEVNAME_H
 
-#include <features.h>
-
-__BEGIN_DECLS
-
 #define ABBREV_DEV  1     /* remove /dev/         */
 #define ABBREV_TTY  2     /* remove tty           */
 #define ABBREV_PTS  4     /* remove pts/          */
 
 unsigned dev_to_tty(char *__restrict ret, unsigned chop, dev_t dev_t_dev, int pid, unsigned int flags);
 
-__END_DECLS
 #endif

proc/escape.h

@@ -1,11 +1,8 @@
 #ifndef PROCPS_PROC_ESCAPE_H
 #define PROCPS_PROC_ESCAPE_H
 
-#include <features.h>
 #include "readproc.h"
 
-__BEGIN_DECLS
-
 
 #define ESC_ARGS     0x1  // try to use cmdline instead of cmd
 #define ESC_BRACKETS 0x2  // if using cmd, put '[' and ']' around it
@@ -14,5 +11,4 @@ __BEGIN_DECLS
 
 int escape_command(char *__restrict const outbuf, const proc_t *__restrict const pp, int bytes, int *cells, unsigned flags);
 
-__END_DECLS
 #endif

proc/numa.h

@@ -20,16 +20,10 @@
 #ifndef PROCPS_NUMA_H
 #define PROCPS_NUMA_H
 
-#include <features.h>
-
-__BEGIN_DECLS
-
 void numa_init (void);
 void numa_uninit (void);
 
 extern int (*numa_max_node) (void);
 extern int (*numa_node_of_cpu) (int);
 
-__END_DECLS
-
 #endif

proc/pwcache.h

@@ -1,17 +1,12 @@
 #ifndef PROCPS_PROC_PWCACHE_H
 #define PROCPS_PROC_PWCACHE_H
 
-#include <features.h>
 #include <sys/types.h>
 
-__BEGIN_DECLS
-
 // used in pwcache and in readproc to set size of username or groupname
 #define P_G_SZ 33
 
 char *pwcache_get_user(uid_t uid);
 char *pwcache_get_group(gid_t gid);
 
-__END_DECLS
-
 #endif

proc/readproc.h

@@ -19,8 +19,6 @@
 // the following is development only, forcing display of "[ duplicate ENUM ]" strings
 // #define FALSE_THREADS        /* set most child string fields to NULL */
 
-__BEGIN_DECLS
-
 
 // This is to help document a transition from pid to tgid/tid caused
 // by the introduction of thread support. It is used in cases where
@@ -261,5 +259,4 @@ proc_t* readeither(PROCTAB *__restrict const PT, proc_t *__restrict x);
 int look_up_our_self(proc_t *p);
 void closeproc(PROCTAB* PT);
 
-__END_DECLS
 #endif

proc/wchan.h

@@ -1,12 +1,6 @@
 #ifndef PROCPS_PROC_WCHAN_H
 #define PROCPS_PROC_WCHAN_H
 
-#include <features.h>
-
-__BEGIN_DECLS
-
 extern const char * lookup_wchan (int pid);
 
-__END_DECLS
-
 #endif