RFR: JDK-8201591 JVM features with "-" in name is not correctly handled

[Magnus Ihse Bursie]

JDK-8201483 caused a regression for enabling JVM features with a dash in 
the name.

Bug: https://bugs.openjdk.java.net/browse/JDK-8201591
Patch inline:
diff --git a/make/autoconf/hotspot.m4 b/make/autoconf/hotspot.m4
--- a/make/autoconf/hotspot.m4
+++ b/make/autoconf/hotspot.m4
@@ -269,9 +269,9 @@
      USER_JVM_FEATURE_LIST=`$ECHO $with_jvm_features | $SED -e 's/,/ /g'`
      AC_MSG_RESULT([$user_jvm_feature_list])
      # These features will be added to all variant defaults
-    JVM_FEATURES=`$ECHO $USER_JVM_FEATURE_LIST | $AWK '{ for (i=1; 
i<=NF; i++) if (!match($i, /-.*/)) print $i }'`
+    JVM_FEATURES=`$ECHO $USER_JVM_FEATURE_LIST | $AWK '{ for (i=1; 
i<=NF; i++) if (!match($i, /^-.*/)) print $i }'`
      # These features will be removed from all variant defaults
-    DISABLED_JVM_FEATURES=`$ECHO $USER_JVM_FEATURE_LIST | $AWK '{ for 
(i=1; i<=NF; i++) if (match($i, /-.*/)) print substr($i, 2) }'`
+    DISABLED_JVM_FEATURES=`$ECHO $USER_JVM_FEATURE_LIST | $AWK '{ for 
(i=1; i<=NF; i++) if (match($i, /^-.*/)) print substr($i, 2) }'`

      # Verify that the user has provided valid features
      BASIC_GET_NON_MATCHING_VALUES(INVALID_FEATURES, $JVM_FEATURES 
$DISABLED_JVM_FEATURES, $VALID_JVM_FEATURES)

/Magnus