faster to compile.

A small selection of packages was tested going from:

Executed in  696.30 secs   fish           external
   usr time   82.98 mins  395.00 micros   82.98 mins
   sys time    9.02 mins    0.00 micros    9.02 mins

to:

Executed in  592.20 secs   fish           external
   usr time   84.84 mins  361.00 micros   84.84 mins
   sys time    8.85 mins   57.00 micros    8.85 mins

Tested by running make -j 12 and wiping staging/build_dir/target_x

Signed-off-by: Rosen Penev <rosenp@gmail.com>

The .pc file points to OS paths instead of target ones.

Remove CMAKE_INSTALL as InstallDev is explicit.

Move MAINTAINER to PKG_MAINTAINER for consistency.

Signed-off-by: Rosen Penev <rosenp@gmail.com>

Supports the more traditional "#include <cjson/cJSON.h>"
instead of dropping them in the root.

Signed-off-by: Karl Palsson <karlp@etactica.com>

New package, new dependency of mosquitto v2.0

Signed-off-by: Karl Palsson <karlp@etactica.com>