pcsc: Allow to disable the PCSC dependency

* PCSC is enabled by default
* --enable-pcsc is enabling it
* --disable-pcscis disabling it
* Fix the makefile of the utilities to not build pcsc and
use the right header files/libraries.
diff --git a/configure.ac b/configure.ac
index 80e2bcc..ef74932 100644
--- a/configure.ac
+++ b/configure.ac
@@ -84,13 +84,15 @@
 
 AC_ARG_ENABLE([pcsc], [AS_HELP_STRING([--disable-pcsc], [Build without PC/SC support])],
     [
-        osmo_ac_have_pcsc=$enableval
+        enable_pcsc=$enableval
     ],
     [
-        PKG_CHECK_MODULES(PCSC, libpcsclite)
-        osmo_ac_have_pcsc="yes"
+        enable_pcsc="yes"
     ])
-AM_CONDITIONAL(ENABLE_PCSC, test "x$osmo_ac_have_pcsc" = "xyes")
+if test "x$enable_pcsc" = "xyes" ; then
+	PKG_CHECK_MODULES(PCSC, libpcsclite)
+fi
+AM_CONDITIONAL(ENABLE_PCSC, test "x$enable_pcsc" = "xyes")
 
 AC_ARG_ENABLE(talloc,
 	[AS_HELP_STRING(