Pass down TARGET_CPPFLAGS for path to header files, and append the
libraries we depend on in TARGET_LDFLAGS. Put TARGET_LDFLAGS at the end
of the command line as is required by modern GCC/binutils.
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
(cherry picked from commit 30159b3886849f94cd065ecece7ac988bfb89548)