Kbuild: move CONFIG_PAM to general configuration

Currently CONFIG_PAM depends on CONFIG_LOGIN, but is used by the httpd applet too.

This patch moves said option to general configuration, thus allowing to
compile httpd with PAM support independently from login.

Signed-off-by: Bartosz Golaszewski <bartekgola@gmail.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
diff --git a/Config.in b/Config.in
index 2c4be2e..38d4ebc 100644
--- a/Config.in
+++ b/Config.in
@@ -257,6 +257,13 @@
 	  at shell prompt will list file named 0xff (single char name
 	  with char value 255), not file named '?'.
 
+config PAM
+	bool "Support for PAM (Pluggable Authentication Modules)"
+	default n
+	help
+	  Use PAM in some busybox applets (currently login and httpd) instead
+	  of direct access to password database.
+
 config LONG_OPTS
 	bool "Support for --long-options"
 	default y