Improve crossbuild configuration

Use meson native features to detect crossbuild, and remove the
user-provided option crossbuild_windows.

app/meson.build

@@ -82,7 +82,9 @@ endif
 
 cc = meson.get_compiler('c')
 
-if not get_option('crossbuild_windows')
+crossbuild_windows = meson.is_cross_build() and host_machine.system() == 'windows'
+
+if not crossbuild_windows
 
     # native build
     dependencies = [

meson_options.txt

@@ -1,6 +1,5 @@
 option('compile_app', type: 'boolean', value: true, description: 'Build the client')
 option('compile_server', type: 'boolean', value: true, description: 'Build the server')
-option('crossbuild_windows', type: 'boolean', value: false, description: 'Build for Windows from Linux')
 option('prebuilt_server', type: 'string', description: 'Path of the prebuilt server')
 option('portable', type: 'boolean', value: false, description: 'Use scrcpy-server from the same directory as the scrcpy executable')
 option('server_debugger', type: 'boolean', value: false, description: 'Run a server debugger and wait for a client to be attached')

release.mk

@@ -70,7 +70,6 @@ build-win32: prepare-deps-win32
 		meson "$(WIN32_BUILD_DIR)" \
 			--cross-file cross_win32.txt \
 			--buildtype release --strip -Db_lto=true \
-			-Dcrossbuild_windows=true \
 			-Dcompile_server=false \
 			-Dportable=true )
 	ninja -C "$(WIN32_BUILD_DIR)"
@@ -83,7 +82,6 @@ build-win64: prepare-deps-win64
 		meson "$(WIN64_BUILD_DIR)" \
 			--cross-file cross_win64.txt \
 			--buildtype release --strip -Db_lto=true \
-			-Dcrossbuild_windows=true \
 			-Dcompile_server=false \
 			-Dportable=true )
 	ninja -C "$(WIN64_BUILD_DIR)"