meson: Replace softmmu_ss -> system_ss

We use the user_ss[] array to hold the user emulation sources,
and the softmmu_ss[] array to hold the system emulation ones.
Hold the latter in the 'system_ss[]' array for parity with user
emulation.

Mechanical change doing:

  $ sed -i -e s/softmmu_ss/system_ss/g $(git grep -l softmmu_ss)

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20230613133347.82210-10-philmd@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
diff --git a/target/i386/meson.build b/target/i386/meson.build
index ae38dc9..1effe1e 100644
--- a/target/i386/meson.build
+++ b/target/i386/meson.build
@@ -12,15 +12,15 @@
 i386_ss.add(when: 'CONFIG_KVM', if_true: files('host-cpu.c'))
 i386_ss.add(when: 'CONFIG_HVF', if_true: files('host-cpu.c'))
 
-i386_softmmu_ss = ss.source_set()
-i386_softmmu_ss.add(files(
+i386_system_ss = ss.source_set()
+i386_system_ss.add(files(
   'arch_dump.c',
   'arch_memory_mapping.c',
   'machine.c',
   'monitor.c',
   'cpu-sysemu.c',
 ))
-i386_softmmu_ss.add(when: 'CONFIG_SEV', if_true: files('sev.c'), if_false: files('sev-sysemu-stub.c'))
+i386_system_ss.add(when: 'CONFIG_SEV', if_true: files('sev.c'), if_false: files('sev-sysemu-stub.c'))
 
 i386_user_ss = ss.source_set()
 
@@ -32,5 +32,5 @@
 subdir('tcg')
 
 target_arch += {'i386': i386_ss}
-target_softmmu_arch += {'i386': i386_softmmu_ss}
+target_softmmu_arch += {'i386': i386_system_ss}
 target_user_arch += {'i386': i386_user_ss}