THRIFT-5179: Fix generated code for struct's named "a" or "b"

Client: cpp
diff --git a/test/Makefile.am b/test/Makefile.am
index 608e488..f1c808e 100755
--- a/test/Makefile.am
+++ b/test/Makefile.am
@@ -167,6 +167,7 @@
 	ThriftTest.thrift \
 	TypedefTest.thrift \
 	UnsafeTypes.thrift \
+	SpecificNameTest.thrift \
 	known_failures_Linux.json \
 	test.py \
 	tests.json \