[RFR]: 8223667: ASAN build broken

[Arthur Eubanks]

Bug: https://bugs.openjdk.java.net/browse/JDK-8223667
Webrev: http://cr.openjdk.java.net/~aeubanks/8223667/webrev.00/index.html

The ASAN build, enabled with --enable-asan, is broken. At some point during
the build, the following message appears:

ERROR: Invalid value for bool option: '0"'
ERROR: Flag parsing failed.

This is in ASAN's flag parsing code, caused by the ASAN_OPTIONS environment
variable having an extra quote at the end.

Instead of using quotes in spec.gmk, use $(SPACE).