Force libad9361 and libad9166 to skip generating doxygen

This gets passed the following error:
/usr/local/bin/doxygen: /lib/x86_64-linux-gnu/libm.so.6: version `GLIBC_2.29' not found (required by /usr/local/bin/doxygen)
CMake Warning at /usr/share/cmake-3.10/Modules/FindDoxygen.cmake:396 (message):
  Unable to determine doxygen version: 1
Call Stack (most recent call first):
  /usr/share/cmake-3.10/Modules/FindDoxygen.cmake:551 (_Doxygen_find_doxygen)
  CMakeLists.txt:127 (find_package)

Signed-off-by: Dan Nechita <dan.nechita@analog.com>

build.sh.inc

@@ -332,6 +332,7 @@ build_libiio () {
 # Build libad9361
 build_libad9361 () {
  cd ${CURDIR}/libad9361
+ sed -i "s/find_package(Doxygen)//" CMakeLists.txt
  rm -rf build && mkdir build && cd build
  cmake_build
  make ${MAKE_J}
@@ -341,6 +342,7 @@ build_libad9361 () {
 # Build libad9166
 build_libad9166 () {
  cd ${CURDIR}/libad9166
+ sed -i "s/find_package(Doxygen)//" CMakeLists.txt
  rm -rf build && mkdir build && cd build
  cmake_build
  make ${MAKE_J}