package/flare-engine: fix check-package failure

Check-package gives error on flare-engine due to trailing whitespace in
flare-engine.mk comment inserted with commit:
https://git.buildroot.net/buildroot/commit/?id=1203cca1b51eefb4ee236d998ab6ec32bdd087d8

Remove trailing whitespace in flare-engine.mk comment.

Signed-off-by: Giulio Benetti <giulio.benetti@micronovasrl.com>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
(cherry picked from commit bf6c06152fbb89ae2a6988a0da8d79259da46674)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/flare-engine/flare-engine.mk

@@ -21,7 +21,7 @@ endif
 
 ifeq ($(BR2_TOOLCHAIN_HAS_GCC_BUG_85180),y)
 # CMakeLists.txt sets CMAKE_CXX_FLAGS_<BUILD_TYPE> depending on
-# BUILD_TYPE, and this comes after the generic CMAKE_CXX_FLAGS. 
+# BUILD_TYPE, and this comes after the generic CMAKE_CXX_FLAGS.
 # Override CMAKE_BUILD_TYPE so no overrides are applied.
 FLARE_ENGINE_CONF_OPTS += -DCMAKE_BUILD_TYPE=Buildroot
 FLARE_ENGINE_CONF_OPTS += -DCMAKE_CXX_FLAGS="$(TARGET_CXXFLAGS) -O0"