AUTOTOOLS: Refactor unicode library detection If $libdir is not in default library path libunistring cannot be found. (pkg-config can not be used in this case). This patch helps to search libunistring in "$libdir" directory. In refactoring part, indentation was updated to be more readable and some duplicated parts were removed.

Provide AM_COND_IF-combatible implementation for old automake systems AM_COND_IF is a very handy construct that is not present on old automake systems such as the one in RHEL5. The original author of the code is Ralf Corsepius <rc040203 -at- freenet.de>

Rename server/ directory to src/ Also update BUILD.txt