target/mips: Only build TCG code when CONFIG_TCG is set

Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20201206233949.3783184-20-f4bug@amsat.org>

target/mips/meson.build

@@ -1,9 +1,11 @@
 mips_ss = ss.source_set()
 mips_ss.add(files(
   'cpu.c',
+  'gdbstub.c',
+))
+mips_ss.add(when: 'CONFIG_TCG', if_true: files(
   'dsp_helper.c',
   'fpu_helper.c',
-  'gdbstub.c',
   'lmmi_helper.c',
   'msa_helper.c',
   'op_helper.c',
@@ -15,11 +17,13 @@ mips_ss.add(when: 'CONFIG_KVM', if_true: files('kvm.c'))
 mips_softmmu_ss = ss.source_set()
 mips_softmmu_ss.add(files(
   'addr.c',
-  'cp0_helper.c',
   'cp0_timer.c',
   'machine.c',
   'mips-semi.c',
 ))
+mips_softmmu_ss.add(when: 'CONFIG_TCG', if_true: files(
+  'cp0_helper.c',
+))
 
 target_arch += {'mips': mips_ss}
 target_softmmu_arch += {'mips': mips_softmmu_ss}