Turns on multiline matching for regex_compile

Now the pattern generated from regex_compile will match on a
line-by-line basis, useful for matching a pattern in a multi-line
commit message.

Change-Id: I3db9ac5f9597c360fc7600ce3b33dfe0cda7d90e

src/builtin/PRED_regex_compile_2.java

diff --git a/src/builtin/PRED_regex_compile_2.java b/src/builtin/PRED_regex_compile_2.java
index 142234f..5c4ef37 100644
--- a/src/builtin/PRED_regex_compile_2.java
+++ b/src/builtin/PRED_regex_compile_2.java
@@ -37,7 +37,7 @@
       if (!a1.isSymbol()) {
         throw new IllegalTypeException(this, 1, "atom", a1);
       }
-      Pattern pattern = Pattern.compile(a1.name());
+      Pattern pattern = Pattern.compile(a1.name(), Pattern.MULTILINE);
 
       if (!a2.unify(new JavaObjectTerm(pattern), engine.trail)) {
         return engine.fail();