Fixed build if BUILD_NDPI=ON. May happen during XCompilation.

Signed-off-by: lns <matzeton@googlemail.com>

CMakeLists.txt

@@ -184,6 +184,9 @@ if(BUILD_NDPI)
         SOURCE_DIR ${CMAKE_CURRENT_SOURCE_DIR}/libnDPI
         DOWNLOAD_COMMAND ""
         CONFIGURE_COMMAND env
+            CC=${CMAKE_C_COMPILER}
+            CXX=false
+            PKG_CONFIG=${PKG_CONFIG_EXECUTABLE}
             CFLAGS=${CMAKE_C_FLAGS}
             LDFLAGS=${CMAKE_MODULE_LINKER_FLAGS}
             CROSS_COMPILE_TRIPLET=${CROSS_COMPILE_TRIPLET}

scripts/get-and-build-libndpi.sh

@@ -12,6 +12,9 @@ flock -x -n 42 || {
 
 cat <<EOF
 ------ environment variables ------
+CC=${CC:-}
+CXX=${CXX:-}
+PKG_CONFIG=${PKG_CONFIG:-}
 CFLAGS=${CFLAGS:-}
 LDFLAGS=${LDFLAGS:-}
 CROSS_COMPILE_TRIPLET=${CROSS_COMPILE_TRIPLET:-}