Revert part of 11ec11c

We can fix the spam this causes in loader.

Author: modmuss50

gradle.properties

@@ -4,7 +4,7 @@ packaging=jar
 description=Mixin (Fabric fork)
 url=https://fabricmc.net
 organization=FabricMC
-buildVersion=0.9.3
+buildVersion=0.9.4
 upstreamMixinVersion=0.8.2
 buildType=RELEASE
 asmVersion=9.1

src/main/java/org/spongepowered/asm/mixin/transformer/MixinInfo.java

@@ -1016,7 +1016,7 @@ private ClassInfo getTargetClass(DeclaredTarget target) throws InvalidMixinExcep
         }
         this.type.validateTarget(target.name, targetInfo);
         if (target.isPrivate && targetInfo.isPublic() && !this.isVirtual()) {
-            this.logger.debug(String.format("@Mixin target %s is public in %s and should be specified in value", target.name, this));
+            this.handleTargetError(String.format("@Mixin target %s is public in %s and should be specified in value", target.name, this));
         }
         return targetInfo;
     }