meson: drop now-unused -DSTANDALONE

If we ever want to add it back, it should be with -DSTANDALONE=0|1, so
that #if instead of #ifdef can be used. We generally converted our internal
defines to that form.

src/repart/meson.build

@@ -25,7 +25,6 @@ executables += [
                 'name' : 'systemd-repart.standalone',
                 'public' : true,
                 'sources' : files('repart.c'),
-                'c_args' : '-DSTANDALONE',
                 'link_with' : [
                         libc_wrapper_static,
                         libbasic_static,

src/shutdown/meson.build

@@ -25,7 +25,6 @@ executables += [
         libexec_template + {
                 'name' : 'systemd-shutdown.standalone',
                 'sources' : systemd_shutdown_sources + systemd_shutdown_extract_sources,
-                'c_args' : '-DSTANDALONE',
                 'link_with' : [
                         libc_wrapper_static,
                         libbasic_static,

src/sysusers/meson.build

@@ -15,7 +15,6 @@ executables += [
                 'name' : 'systemd-sysusers.standalone',
                 'public' : true,
                 'sources' : files('sysusers.c'),
-                'c_args' : '-DSTANDALONE',
                 'link_with' : [
                         libc_wrapper_static,
                         libbasic_static,

src/tmpfiles/meson.build

@@ -23,7 +23,6 @@ executables += [
                 'name' : 'systemd-tmpfiles.standalone',
                 'public' : true,
                 'sources' : systemd_tmpfiles_sources + systemd_tmpfiles_extract_sources,
-                'c_args' : '-DSTANDALONE',
                 'link_with' : [
                         libc_wrapper_static,
                         libbasic_static,