meson: inline output file names

Before 7d247d3cb8, we needed the file name
twice. But now we only need it once, so no need to overcomplicate things
by defining a variable with a single use.

When a variable is used, it's also easier to make a mistake and e.g.
accidentally reuse the variable later.

src/basic/meson.build

@@ -129,25 +129,22 @@ foreach item : [
         ['errno',      [],                 '',        ['<errno.h>'],            ],
 ]
 
-        fname = '@0@-list.txt'.format(item[0])
         generate_list = files('generate-@0@-list.sh'.format(item[0]))
         list_txt = custom_target(
                 input : [generate_list, item[1]],
-                output : fname,
+                output : '@0@-list.txt'.format(item[0]),
                 command : [env, 'bash', generate_list, cpp, system_include_args],
                 capture : true)
 
-        fname = '@0@-from-name.gperf'.format(item[0])
         gperf_file = custom_target(
                 input : list_txt,
-                output : fname,
+                output : '@0@-from-name.gperf'.format(item[0]),
                 command : [generate_gperfs, item[0], item[2], '@INPUT@'] + item[3],
                 capture : true)
 
-        fname = '@0@-from-name.inc'.format(item[0])
         target1 = custom_target(
                 input : gperf_file,
-                output : fname,
+                output : '@0@-from-name.inc'.format(item[0]),
                 command : [gperf,
                            '-L', 'ANSI-C', '-t', '--ignore-case',
                            '-N', 'lookup_@0@'.format(item[0]),
@@ -156,11 +153,10 @@ foreach item : [
                            '@INPUT@'],
                 capture : true)
 
-        fname = '@0@-to-name.inc'.format(item[0])
         awkscript = '@0@-to-name.awk'.format(item[0])
         target2 = custom_target(
                 input : [awkscript, list_txt],
-                output : fname,
+                output : '@0@-to-name.inc'.format(item[0]),
                 command : [awk, '-f', '@INPUT0@', '@INPUT1@'],
                 capture : true)
 
@@ -191,19 +187,17 @@ filesystems_gperf_h = custom_target(
         command : [gperf, '@INPUT@', '--output-file', '@OUTPUT@'])
 
 generate_filesystem_list = find_program('generate-filesystem-list.py')
-fname = 'filesystem-list.inc'
 filesystem_list_inc = custom_target(
         input : 'filesystems-gperf.gperf',
-        output : fname,
+        output : 'filesystem-list.inc',
         command : [generate_filesystem_list,
                    '@INPUT@'],
         capture : true)
 
 generate_filesystem_switch_case_inc = find_program('generate-filesystem-switch-case.py')
-fname = 'filesystem-switch-case.inc'
 filesystem_switch_case_inc = custom_target(
         input : 'filesystems-gperf.gperf',
-        output : fname,
+        output : 'filesystem-switch-case.inc',
         command : [generate_filesystem_switch_case_inc,
                    '@INPUT@'],
         capture : true)