Add _DISABLE_CONSTEXPR_MUTEX_CONSTRUCTOR flag (#77)

Also: Correct annotations on replicator creation

Author: bmeike

android/lib/src/main/java/com/couchbase/lite/Replicator.java

@@ -15,6 +15,7 @@
 //
 package com.couchbase.lite;
 
+import androidx.annotation.GuardedBy;
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
 import androidx.annotation.VisibleForTesting;
@@ -52,6 +53,7 @@ public Replicator(@NonNull ReplicatorConfiguration config) {
             : new AndroidConnectivityObserver(mgr, Replicator.this::getC4Replicator);
     }
 
+    @GuardedBy("getDbLock()")
     @Override
     @NonNull
     protected C4Replicator createReplicatorForTarget(@NonNull Endpoint target) throws LiteCoreException {

java/lib/build.gradle

@@ -288,6 +288,7 @@ model {
                     cppCompiler.args '/EHsc'
                     cppCompiler.args '/wd4068'
                     cppCompiler.args '/std:c++17'
+                    cppCompiler.args '-D_DISABLE_CONSTEXPR_MUTEX_CONSTRUCTOR'
                     linker.args "/def:${ETC_DIR}/ld/jni_win.ld"
                 }
                 else if (targetPlatform.operatingSystem.linux) {

java/lib/src/main/java/com/couchbase/lite/Replicator.java

@@ -15,6 +15,7 @@
 //
 package com.couchbase.lite;
 
+import androidx.annotation.GuardedBy;
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
 import androidx.annotation.VisibleForTesting;
@@ -34,6 +35,7 @@ public final class Replicator extends AbstractReplicator {
     @VisibleForTesting
     Replicator(@Nullable NetworkConnectivityManager ignore, @NonNull ReplicatorConfiguration config) { super(config); }
 
+    @GuardedBy("getDbLock()")
     @NonNull
     @Override
     protected C4Replicator createReplicatorForTarget(@NonNull Endpoint target) throws LiteCoreException {