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/meson.build b/meson.build
index 0faca1d..6ef78ea 100644
--- a/meson.build
+++ b/meson.build
@@ -3171,7 +3171,7 @@
 io_ss = ss.source_set()
 qmp_ss = ss.source_set()
 qom_ss = ss.source_set()
-softmmu_ss = ss.source_set()
+system_ss = ss.source_set()
 specific_fuzz_ss = ss.source_set()
 specific_ss = ss.source_set()
 stub_ss = ss.source_set()
@@ -3396,7 +3396,7 @@
   # os-posix.c contains POSIX-specific functions used by qemu-storage-daemon,
   # os-win32.c does not
   blockdev_ss.add(when: 'CONFIG_POSIX', if_true: files('os-posix.c'))
-  softmmu_ss.add(when: 'CONFIG_WIN32', if_true: [files('os-win32.c')])
+  system_ss.add(when: 'CONFIG_WIN32', if_true: [files('os-win32.c')])
 endif
 
 common_ss.add(files('cpus-common.c'))
@@ -3496,7 +3496,7 @@
       if d == 'block'
         block_ss.add_all(module_ss)
       else
-        softmmu_ss.add_all(module_ss)
+        system_ss.add_all(module_ss)
       endif
     endif
   endforeach
@@ -3601,7 +3601,7 @@
                               build_by_default: false)
 migration = declare_dependency(link_with: libmigration,
                                dependencies: [zlib, qom, io])
-softmmu_ss.add(migration)
+system_ss.add(migration)
 
 block_ss = block_ss.apply(config_host, strict: false)
 libblock = static_library('block', block_ss.sources() + genh,
@@ -3662,10 +3662,10 @@
   alias_target('modules', emulator_modules)
 endif
 
-softmmu_ss.add(authz, blockdev, chardev, crypto, io, qmp)
+system_ss.add(authz, blockdev, chardev, crypto, io, qmp)
 common_ss.add(qom, qemuutil)
 
-common_ss.add_all(when: 'CONFIG_SYSTEM_ONLY', if_true: [softmmu_ss])
+common_ss.add_all(when: 'CONFIG_SYSTEM_ONLY', if_true: [system_ss])
 common_ss.add_all(when: 'CONFIG_USER_ONLY', if_true: user_ss)
 
 common_all = common_ss.apply(config_all, strict: false)