Fix warnings found by -Wmising-variable-declarations.

This self-written compiler warning, which is hopefully going to be
committed into LLVM sources soon, warns about potentially missing
`static' keywords, similar to -Wmissing-prototypes.

- bin/pax: Move external declaration of chdname and s_mask into extern.h.
- bin/setfacl: Move setfacl.c-specific stuff out of setfacl.h.
- sbin/mount_fusefs: Remove char *progname; use getprogname().
- others: add `static' where possible.

ggatec/ggatec.c

@@ -55,7 +55,7 @@
 #include "ggate.h"
 
 
-enum { UNSET, CREATE, DESTROY, LIST, RESCUE } action = UNSET;
+static enum { UNSET, CREATE, DESTROY, LIST, RESCUE } action = UNSET;
 
 static const char *path = NULL;
 static const char *host = NULL;

ggated/ggated.c

@@ -92,12 +92,12 @@ struct ggd_export {
 
 static const char *exports_file = GGATED_EXPORT_FILE;
 static int got_sighup = 0;
-in_addr_t bindaddr;
+static in_addr_t bindaddr;
 
 static TAILQ_HEAD(, ggd_request) inqueue = TAILQ_HEAD_INITIALIZER(inqueue);
 static TAILQ_HEAD(, ggd_request) outqueue = TAILQ_HEAD_INITIALIZER(outqueue);
-pthread_mutex_t inqueue_mtx, outqueue_mtx;
-pthread_cond_t inqueue_cond, outqueue_cond;
+static pthread_mutex_t inqueue_mtx, outqueue_mtx;
+static pthread_cond_t inqueue_cond, outqueue_cond;
 
 static SLIST_HEAD(, ggd_export) exports = SLIST_HEAD_INITIALIZER(exports);
 static LIST_HEAD(, ggd_connection) connections = LIST_HEAD_INITIALIZER(connections);

ggatel/ggatel.c

@@ -47,7 +47,7 @@
 #include "ggate.h"
 
 
-enum { UNSET, CREATE, DESTROY, LIST, RESCUE } action = UNSET;
+static enum { UNSET, CREATE, DESTROY, LIST, RESCUE } action = UNSET;
 
 static const char *path = NULL;
 static int unit = G_GATE_UNIT_AUTO;