package/libcpprestsdk: add optional brotli dependency

Official brotli support has been added in version 2.10.8 and
https://github.com/Microsoft/cpprestsdk/commit/f3824aa8d01705656e7ee4c0c49ae6980c868b20

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/libcpprestsdk/libcpprestsdk.mk

@@ -16,6 +16,13 @@ ifeq ($(BR2_TOOLCHAIN_HAS_LIBATOMIC),y)
 LIBCPPRESTSDK_CONF_OPTS += -DCMAKE_CXX_FLAGS="$(TARGET_CXXFLAGS) -latomic"
 endif
 
+ifeq ($(BR2_PACKAGE_BROTLI),y)
+LIBCPPRESTSDK_DEPENDENCIES += brotli
+LIBCPPRESTSDK_CONF_OPTS += -DCPPREST_EXCLUDE_BROTLI=OFF
+else
+LIBCPPRESTSDK_CONF_OPTS += -DCPPREST_EXCLUDE_BROTLI=ON
+endif
+
 ifeq ($(BR2_PACKAGE_WEBSOCKETPP),y)
 LIBCPPRESTSDK_DEPENDENCIES += websocketpp
 LIBCPPRESTSDK_CONF_OPTS += -DCPPREST_EXCLUDE_WEBSOCKETS=OFF