Move stopindexing from exe to lib to avoid symbol errors (win)

src/index/indexer.cpp

@@ -41,6 +41,10 @@ using std::list;
 using std::string;
 using std::vector;
 
+// Global stop request flag. This is checked in a number of place in the
+// indexing routines.
+int stopindexing;
+
 // This would more logically live in recollindex.cpp, but then librecoll would
 // have an undefined symbol
 ConfSimple idxreasons;

src/index/recollindex.cpp

@@ -100,10 +100,6 @@ static void cleanup()
     recoll_exitready();
 }
 
-// Global stop request flag. This is checked in a number of place in the
-// indexing routines.
-int stopindexing;
-
 // Receive status updates from the ongoing indexing operation
 // Also check for an interrupt request and return the info to caller which
 // should subsequently orderly terminate what it is doing.