hostapd: fix LICENSE + misc recipe updates

According to the COPYING file in the top level of the hostapd source
tree, hostapd was re-licensed from dual BSD/GPLv2 to BSD only in
February 2012. This change has apparently gone unnoticed for the
past 6 years, but fix it now.

Also use pkg-config to find libnl headers (instead of hardcoding),
append to base do_configure (instead of over-riding), respect OE's
default CFLAGS (instead of ignoring) and make some minor formatting
tweaks to bring the recipe more in line with the OE Styleguide.

Signed-off-by: Andre McCurdy <armccurdy@gmail.com>
Signed-off-by: Armin Kuster <akuster808@gmail.com>

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