Makefile: add cross-compile functionality
Makefile: add cross-compile functionality

Add cross-compile functionality to the Makefile and add an "install"
target. This makes pam_ldapdb "Yocto Project Compileable".

Signed-off-by: Richard Leitner <0f2fdd4d2dfbb4dde6236fd550af0a2071b34781@skidata.com>

rmbreak/pam_ldapdb