makefile: Correct experimental/incomplete simulator list and add to CI build

.travis.yml

@@ -12,6 +12,8 @@ env:
   - SIM="id16 id32 sds lgp h316 cdc1700 swtp6800mp-a swtp6800mp-a2 tx-0 ssem b5500"
   - SIM="besm6 imlac tt2500 intel-mds"
   - SIM="scelbi 3b2 i701 i704 i7010 i7070 i7080 i7090 sigma uc15 i650"
+  # These are supposed to match experimental in makefile.
+  - SIM="alpha pdq3 sage"
 sudo: required
 install: sh -ex .travis/deps.sh "$TRAVIS_OS_NAME"
 script: make $SIM

makefile

@@ -2130,7 +2130,7 @@ ALL = pdp1 pdp4 pdp7 pdp8 pdp9 pdp15 pdp11 pdp10 \
 
 all : ${ALL}
 
-EXPERIMENTAL = cdc1700
+EXPERIMENTAL = alpha pdq3 sage
 
 experimental : ${EXPERIMENTAL}