Pull in new API function from upstream.

Signed-off-by: Jakov Petrina <jakov.petrina@sartura.hr>

Ninja was merged to base and therefore we can now use normal cmake.mk

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

Signed-off-by: Jakov Petrina <jakov.petrina@sartura.hr>

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>

Signed-off-by: Jakov Petrina <jakov.petrina@sartura.hr>

Maintainer: @jpetrina
Compile tested: arm, ipq4018, master@r15169-36e0268aa6
Run tested: arm, ipq4018, master@r15169-36e0268aa6

Description:

UCI2 is a C library that provides an alternative UCI parser with an Abstract
Syntax Tree (AST) representation of configuration files.

Signed-off-by: Jakov Petrina <jakov.petrina@sartura.hr>
Tested-by: Jakov Petrina <jakov.petrina@sartura.hr>