fix(pinelog): Mark benchmark tests as such in Meson

Prior to this change, the pinelog benchmark suite was running as a
regular test, however, this is not ideal since it can result in timing
issues and giving false data to the runners.

This change explicitly marks them as benchmarks, so they can run using
`meson test --benchmark`

meson.build

@@ -21,10 +21,8 @@ level_class = ['nolvl', 'lvl']
 backtrace_class = ['notr', 'tr']
 
 test_files = []
-test_name_template = '@0@-@1@-@2@-@3@'
-foreach test_type: ['bench', 'test']
-	test_src = test_type + '_pinelog.c'
-	foreach date_arg: [0, 1]
+test_name_template = '-@0@-@1@-@2@'
+foreach date_arg: [0, 1]
 	date_def = '-DPINELOG_SHOW_DATE=' + date_arg.to_string()
 	date_name = date_arg == 1 ? 'ts' : 'nots'
 
@@ -36,10 +34,7 @@ foreach test_type: ['bench', 'test']
 			backtrace_def = '-DPINELOG_SHOW_BACKTRACE=' + backtrace_arg.to_string()
 			backtrace_name = backtrace_arg == 1 ? 'tr' : 'notr'
 
-				test_name = test_name_template.format(test_type,
-					date_name, level_name, backtrace_name)
-				test_exe = executable(test_name, test_src, 'pinelog.c',
-					c_args: [
+			c_args = [
 				'-DPINELOG_FATAL_STR="F"',
 				'-DPINELOG_ERROR_STR="E"',
 				'-DPINELOG_WARNING_STR="W"',
@@ -50,10 +45,17 @@ foreach test_type: ['bench', 'test']
 				'-DPINELOG_DEFAULT_STREAM=stderr',
 				'-DPINELOG_TEST',
 				date_def, level_def, backtrace_def
-						])
+			]
+			test_name = test_name_template.format(
+				date_name, level_name, backtrace_name)
 
-				test(test_name, test_exe, protocol: 'tap')
-			endforeach
+			test_exe = executable('test' + test_name, 'test_pinelog.c', 'pinelog.c',
+				c_args: c_args)
+			test('test' + test_name, test_exe, protocol: 'tap')
+
+			bench_exe = executable('bench' + test_name, 'bench_pinelog.c', 'pinelog.c',
+				c_args: c_args)
+			benchmark('bench' + test_name, bench_exe, protocol: 'tap')
 		endforeach
 	endforeach
 endforeach