utils/smstools3: update to 3.1.21

Update package to 3.1.21, remove parts of patches which were already
included upstream, update some OpenWrt specific things.

Signed-off-by: Paul Wassi <p.wassi@gmx.at>

utils/smstools3/patches/001-smsd.patch

@@ -1,13 +0,0 @@
---- a/src/smsd.c	2010-09-21 13:47:48.000000000 +0300
-+++ b/src/smsd.c	2013-03-05 05:26:26.000000000 +0300
-@@ -5200,8 +5200,8 @@
- 	int result = 1;
- 	char *cmd;
- 	char *p;
--	char answer[500];
--	char buffer[600];
-+	char answer[1024];
-+	char buffer[1024];
- 	int fd;
- 	int log_retry = 3;
- 	int i;

utils/smstools3/patches/002-Makefile.patch

@@ -9,12 +9,3 @@
  
  # Uncomment for Solaris
  # CFLAGS += -D SOLARIS
-@@ -43,7 +43,7 @@ smsd: smsd.c extras.o locking.o cfgfile.
- 
- ifneq (,$(findstring SOLARIS,$(CFLAGS)))
- ifeq (,$(findstring DISABLE_INET_SOCKET,$(CFLAGS)))
--override LFLAGS += -lsocket -lnsl
-+	override LFLAGS += -lsocket -lnsl
- endif
- endif
- 

utils/smstools3/patches/003-bash-ash.patch

@@ -0,0 +1,8 @@
+--- a/scripts/sendsms
++++ b/scripts/sendsms
+@@ -1,4 +1,4 @@
+-#!/bin/bash
++#!/bin/ash
+ # This script send a text sms at the command line by creating
+ # a sms file in the outgoing queue.
+