Require libosmocore 1.1.0

Older commit made use of gsm48_decode_bcd_number2(), which is available
in libosmocore 1.1.0 onwards, but forgot to increase configure.ac
requirements.

Fixes: fb625041601c525c23c96482250157dddb0941a4
Change-Id: I89b37be55fc4ba22b90e9aab9a5989573df2ae38
diff --git a/configure.ac b/configure.ac
index 7b985b9..4c39681 100644
--- a/configure.ac
+++ b/configure.ac
@@ -138,9 +138,9 @@
 
 AM_INIT_AUTOMAKE([foreign])
 
-PKG_CHECK_MODULES(LIBOSMOCORE, libosmocore >= 0.11.0)
-PKG_CHECK_MODULES(LIBOSMOVTY, libosmovty >= 0.11.0)
-PKG_CHECK_MODULES(LIBOSMOCTRL, libosmoctrl >= 0.11.0)
+PKG_CHECK_MODULES(LIBOSMOCORE, libosmocore >= 1.1.0)
+PKG_CHECK_MODULES(LIBOSMOVTY, libosmovty >= 1.1.0)
+PKG_CHECK_MODULES(LIBOSMOCTRL, libosmoctrl >= 1.1.0)
 
 AC_ARG_ENABLE(sanitize,
 	[AS_HELP_STRING(