package/flutter-engine: bump to version 3.27.1

Other changes:
  - Upstream dropped the --enable-impeller-vulkan configuration option.
  - Add a .hash file for the LICENSE file
  - Change the wording of the comment to reflect the addition of the
    .hash file.

Signed-off-by: Adam Duskett <adam.duskett@amarulasolutions.com>
Signed-off-by: Arnout Vandecappelle <arnout@mind.be>

package/flutter-engine/flutter-engine.hash

@@ -0,0 +1 @@
+sha256  89519eca6f7b9529b35bdddd623a58c3af06a88c458dbd6531ddb4675acf75a9  LICENSE

package/flutter-engine/flutter-engine.mk

@@ -19,9 +19,10 @@
 #  - Create a source tarball.
 #  - Copy the source tarball to the $(FLUTTER_ENGINE_DL_DIR) directory.
 #
-# There is no hash provided, as the gn binary (used for configuration) relies
-# on the .git directories. As such, a reproducible tarball is not possible.
-FLUTTER_ENGINE_VERSION = 3.24.4
+# There is no hash provided for the source tarball, as the gn binary
+# (used for configuration) relies on the .git directories. As such, a
+# reproducible tarball is not possible.
+FLUTTER_ENGINE_VERSION = 3.27.1
 
 # There is nothing for Buildroot to download. This is handled by gclient.
 FLUTTER_ENGINE_SITE =
@@ -145,7 +146,7 @@ endif
 
 # There is no --disable-vulkan option
 ifeq ($(BR2_PACKAGE_MESA3D_VULKAN_DRIVER),y)
-FLUTTER_ENGINE_CONF_OPTS += --enable-vulkan --enable-impeller-vulkan
+FLUTTER_ENGINE_CONF_OPTS += --enable-vulkan
 endif
 
 ifeq ($(BR2_PACKAGE_XORG7)$(BR2_PACKAGE_LIBXCB),yy)