Update `examples/**` to provide `--local-engine-host`. (#44610)

Partial work towards https://github.com/flutter/flutter/issues/132245.

examples/glfw/run.sh

diff --git a/examples/glfw/run.sh b/examples/glfw/run.sh
index 9c3cd34..5fa0d0f 100755
--- a/examples/glfw/run.sh
+++ b/examples/glfw/run.sh
@@ -28,7 +28,8 @@
 cp ../../main.dart lib/main.dart
 flutter build bundle \
         --local-engine-src-path ../../../../../ \
-        --local-engine=$variant
+        --local-engine=$variant \
+        --local-engine-host=$variant
 cd -
 
 #################################################################

examples/glfw_drm/run.sh

diff --git a/examples/glfw_drm/run.sh b/examples/glfw_drm/run.sh
index 0ae097e..5b4d9d4 100755
--- a/examples/glfw_drm/run.sh
+++ b/examples/glfw_drm/run.sh
@@ -24,7 +24,8 @@
 cp ../../main.dart lib/main.dart
 flutter build bundle \
         --local-engine-src-path ../../../../../ \
-        --local-engine=host_debug_unopt
+        --local-engine=host_debug_unopt \
+        --local-engine-host=host_debug_unopt
 cd -
 
 #################################################################

examples/vulkan_glfw/run.sh

diff --git a/examples/vulkan_glfw/run.sh b/examples/vulkan_glfw/run.sh
index 7438dc3..c2841dd 100755
--- a/examples/vulkan_glfw/run.sh
+++ b/examples/vulkan_glfw/run.sh
@@ -18,7 +18,8 @@
 #cp ../../main.dart lib/main.dart
 flutter build bundle \
         --local-engine-src-path ../../../../../ \
-        --local-engine=host_debug_unopt
+        --local-engine=host_debug_unopt \
+        --local-engine-host=host_debug_unopt
 popd > /dev/null
 
 #################################################################