Use large error/log buffers in test harness.

Ninja produces quite a bit of output so error messages are often truncated by the default error/log buffers. Use large buffers in the test harness to capture the error even when there is a lot of output.

Ninja has introduced a --quiet option, but it is currently too new to be in any of our test distributions.

test/src/meson.build

@@ -56,6 +56,11 @@ executable(
     test_help_auto_c_inc,
     test_parse_auto_c_inc,
     include_directories: include_directories('.', '../../src'),
+    c_args: [
+        # Use large buffer sizes to capture large error/log outputs
+        '-DERROR_MESSAGE_BUFFER_SIZE=262144',
+        '-DLOG_BUFFER_SIZE=262144',
+    ],
     dependencies: [
         lib_bz2,
         lib_yaml,