Update sqlite3 from 3.13 to 3.19.3 (2017-06-08)

Fix #125 Incompatibility in 3.19.0 using a new CMake variable SQLITE_USE_LEGACY_STRUCT

CHANGELOG.txt

@@ -94,3 +94,7 @@ Version 2.0.0 - July 25 2016
     Remove Column::errmsg() method : use Database or Statement equivalents
     More unit tests, with code coverage status on the GitHub page
     Do not force MSVC to use static runtime if unit-tests are not build
+
+Version 2.1.0 - July 18 2017
+    Update SQLite3 from 3.13 to latest 3.19.3 (2017-06-08)
+    

CMakeLists.txt

@@ -89,6 +89,12 @@ if (SQLITE_ENABLE_ASSERT_HANDLER)
     add_definitions(-DSQLITECPP_ENABLE_ASSERT_HANDLER)
 endif (SQLITE_ENABLE_ASSERT_HANDLER)
 
+option(SQLITE_USE_LEGACY_STRUCT "Fallback to forward declaration of legacy struct sqlite3_value (pre SQLite 3.19)" OFF)
+if (SQLITE_USE_LEGACY_STRUCT) 
+    # Force forward declaration of legacy struct sqlite3_value (pre SQLite 3.19)
+    add_definitions(-DSQLITE_USE_LEGACY_STRUCT)
+endif (SQLITE_USE_LEGACY_STRUCT)
+
 
 ## Build the C++ Wrapper ##
 
@@ -185,6 +191,12 @@ install(EXPORT ${PROJECT_NAME}Config DESTINATION lib/cmake/${PROJECT_NAME})
 
 ## Build provided copy of SQLite3 C library ##
 
+# TODO NOCOMMIT
+#find_package(sqlite3)
+#if(sqlite3_VERSION VERSION_LESS "3.19")
+#    set_target_properties(SQLiteCpp PROPERTIES COMPILE_FLAGS "-DSQLITECPP_HAS_MEM_STRUCT")
+#endif()
+
 option(SQLITECPP_INTERNAL_SQLITE "Add the internal SQLite3 source to the project." ON)
 if (SQLITECPP_INTERNAL_SQLITE)
     # build the SQLite3 C library (for ease of use/compatibility) versus Linux sqlite3-dev package

include/SQLiteCpp/Database.h

@@ -17,8 +17,13 @@
 // Forward declarations to avoid inclusion of <sqlite3.h> in a header
 struct sqlite3;
 struct sqlite3_context;
+
+#ifndef SQLITE_USE_LEGACY_STRUCT // Since SQLITE 3.19 (used by default since SQLiteCpp 2.1.0)
+typedef struct sqlite3_value sqlite3_value;
+#else // Before SQLite 3.19 (legacy struct forward declaration can be activated with CMake SQLITECPP_LEGACY_STRUCT var)
 struct Mem;
 typedef struct Mem sqlite3_value;
+#endif
 
 
 namespace SQLite