build: Remove substitution of *_OBJ variables Remove substitution of *_OBJ variables (e.g. POPT_OBJ or PCRE_OBJ) from configure scripts as they don't seem to be set or used by anything. Reviewed-by: Jakub Hrozek <jhrozek@redhat.com>

AUTOTOOLS: Use pkg-config to detect libraries. We used pkg-config only as a fallback if header files was not found, but detection of library failed in case of available header file and linking problem (missing -Ldir). This patch prefers pkg-config.

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