Makefiles: drop -L/-I to system paths

The toolchain automatically handles them and they break cross compiling.

LDFLAGS should also come before object files, some flags (eg,
-Wl,as-needed) can break things if they are in the wrong place)

Gentoo-Bug: https://bugs.gentoo.org/500674

Signed-off-by: Jason Zaman <[email protected]>
27 files changed