Revert "fix: Remove references to the obsolete jboss-logmanager-embedded."

This reverts commit a15a9c247121d5c7593db8ed654c761cac3efcea.

The references are still required for backward-compatibility.

Change-Id: Id6e3af93f50846e1955516373162f43b5fe5a655
diff --git a/core/pom.xml b/core/pom.xml
index 7082467..9590957 100644
--- a/core/pom.xml
+++ b/core/pom.xml
@@ -23,6 +23,11 @@
   <dependencies>
     <dependency>
       <groupId>org.jboss.logmanager</groupId>
+      <artifactId>jboss-logmanager-embedded</artifactId>
+      <version>1.1.1</version>
+    </dependency>
+    <dependency>
+      <groupId>org.jboss.logmanager</groupId>
       <artifactId>jboss-logmanager</artifactId>
       <version>3.1.2.Final</version>
       <optional>true</optional>