asdk-repo-libdce

[LINUX] Fix for make install

This patch fixes make install. All the required headers are
copied to $(includedir)/dce on make install.
Unused variables(X11 and WAYLAND) are removed in Makefile.am and
pkg-config on libmmrpc is removed as no libmmrpc.pc is available.
xdc_target_types__=gnu/targets/std.h is added to libdce.h, so
that applications need not do it when using libdce.h.

Change-Id: I8cc70aa2102becdbdc4c6b1e38e2aaa91739c4cc
Signed-off-by: Sathishkumar <x0203598@ti.com>