global: Use check-local in Makefile.am instead of overriding check directly This helps with dependency problems, like running "make check" in lib-storage without "make" first would try to compile the test programs too early and fail.

auth-var-expand-crypt plugin: Add missing ldflags

var-expand-crypt-plugin: Add test suite

var-expand-crypt: Encryption/decryption support for var-expand Registers new encrypt and decrypt processors for var-expand.