add missing test from -fdollar-in-identifiers commit

Commit 5ce2154c ("-fdollar-in-identifiers addon", 20-04-2015) forgot
to include the test files from Daniel's patch.

Signed-off-by: Ramsay Jones <ramsay@ramsay1.demon.co.uk>

tests/tests2/76_dollars_in_identifiers.expect

@@ -0,0 +1,14 @@
+fred=10
+joe=20
+henry=30
+fred2=10
+joe2=20
+henry2=30
+fred10=100
+joe_10=2
+local=10
+a100$=100
+a$$=1000
+a$c$b=2121
+$100=10000
+$$$=money