target/arm/kvm-stub: compile file once (system)

Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
Message-id: 20250512180502.2395029-34-pierrick.bouvier@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

target/arm/meson.build

@@ -15,7 +15,7 @@ arm_system_ss.add(files(
   'arm-qmp-cmds.c',
   'machine.c',
 ))
-arm_system_ss.add(when: 'CONFIG_KVM', if_true: files('hyp_gdbstub.c', 'kvm.c'), if_false: files('kvm-stub.c'))
+arm_system_ss.add(when: 'CONFIG_KVM', if_true: files('hyp_gdbstub.c', 'kvm.c'))
 arm_system_ss.add(when: 'CONFIG_HVF', if_true: files('hyp_gdbstub.c'))
 
 arm_user_ss = ss.source_set()
@@ -32,6 +32,7 @@ arm_user_ss.add(files(
 arm_common_system_ss.add(files('cpu.c'), capstone)
 arm_common_system_ss.add(when: 'TARGET_AARCH64', if_false: files(
   'cpu32-stubs.c'))
+arm_common_system_ss.add(when: 'CONFIG_KVM', if_false: files('kvm-stub.c'))
 arm_common_system_ss.add(files(
   'arch_dump.c',
   'arm-powerctl.c',