lvm2: improved to build/install the application library

Note:

The initial reason for enabling this feature is, that the new udisks
package is needing this library for its lvm2 support.

base/lvm2/lvm2.conf

@@ -50,6 +50,9 @@ if pkginstalled pkgconfig; then
 	var_append extraconfopt ' ' '--enable-pkgconfig'
 fi
 
+# build application library
+var_append extraconfopt ' ' '--enable-applib'
+
 # build shared command library
 var_append extraconfopt ' ' '--enable-cmdlib'