bin: print usage() in stdout.

(cherry picked from commit b090e1a0bd32cabd8fe81bd756d419ee4b170ef7)

bin/xbps-bin/main.c

@@ -43,7 +43,7 @@ static struct xbps_handle xh;
 static void __attribute__((noreturn))
 usage(bool fail)
 {
-	fprintf(stderr,
+	fprintf(stdout,
 	    "Usage: xbps-bin [options] target [arguments]\n\n"
 	    "[options]\n"
 	    " -A           Enable Automatic installation (shown as orphan)\n"

bin/xbps-create/main.c

@@ -58,7 +58,7 @@ static const char *destdir;
 static void __attribute__((noreturn))
 usage(void)
 {
-	fprintf(stderr,
+	fprintf(stdout,
 	"usage: %s [options] [file1] [file2] ...\n\n"
 	"  Options:\n"
 	"    -A, --architecture   Package architecture (e.g: noarch, i686, etc).\n"

bin/xbps-dgraph/main.c

@@ -100,7 +100,7 @@ die(const char *fmt, ...)
 static void __attribute__((noreturn))
 usage(void)
 {
-	fprintf(stderr,
+	fprintf(stdout,
 	"Usage: xbps-dgraph [options] <pkgname>\n\n"
 	" Options\n"
 	"    -c\t\tPath to configuration file\n"

bin/xbps-repo/main.c

@@ -41,7 +41,7 @@
 static void __attribute__((noreturn))
 usage(bool fail)
 {
-	fprintf(stderr,
+	fprintf(stdout,
 	    "Usage: xbps-repo [options] target [arguments]\n\n"
 	    "[options]\n"
 	    " -C file      Full path to configuration file\n"

bin/xbps-uhelper/main.c

@@ -60,7 +60,7 @@ write_plist_file(prop_dictionary_t dict, const char *file)
 static void __attribute__((noreturn))
 usage(void)
 {
-	fprintf(stderr,
+	fprintf(stdout,
 	"usage: xbps-uhelper [options] [action] [args]\n"
 	"\n"
 	"  Available actions:\n"