[tests] Add missed test file to Makefile/meson

It was introduced in 205737acdc but was
not actually used.

See https://github.com/harfbuzz/harfbuzz/issues/2098

test/shaping/data/in-house/Makefile.sources

@@ -57,6 +57,7 @@ TESTS = \
 	tests/use-indic3.tests \
 	tests/use-marchen.tests \
 	tests/use-syllable.tests \
+	tests/use-vowel-letter-spoofing.tests \
 	tests/use.tests \
 	tests/variations.tests \
 	tests/variations-rvrn.tests \

test/shaping/data/in-house/meson.build

@@ -57,6 +57,7 @@ in_house_tests = [
   'use-indic3.tests',
   'use-marchen.tests',
   'use-syllable.tests',
+  'use-vowel-letter-spoofing.tests',
   'use.tests',
   'variations.tests',
   'variations-rvrn.tests',