complete SQLite-3.8.1 porting, and auto generate porting code

components/external/SQLite-3.8.1/src/mem1.c

@@ -76,13 +76,14 @@ static malloc_zone_t* _sqliteZone_;
         (_sqliteZone_ ? _sqliteZone_->size(_sqliteZone_,x) : malloc_size(x))
 
 #elif defined(SQLITE_OS_RTT)
+#include <rtthread.h>
 /*
 ** Use standard C library malloc and free on non-Apple systems.
 ** Also used by rt-thread systems if SQLITE_WITHOUT_ZONEMALLOC is defined.
 */
-#define SQLITE_MALLOC(x)    rt_malloc(x)
+#define SQLITE_MALLOC(x)    rt_malloc((rt_size_t)x)
 #define SQLITE_FREE(x)      rt_free(x)
-#define SQLITE_REALLOC(x,y) rt_realloc((x),(y))
+#define SQLITE_REALLOC(x,y) rt_realloc((x),(rt_size_t)(y))
 
 #if (!defined(SQLITE_WITHOUT_MSIZE)) \
       && (defined(HAVE_MALLOC_H) && defined(HAVE_MALLOC_USABLE_SIZE))

components/external/SQLite-3.8.1/tool/mksqlite3c.tcl

@@ -247,6 +247,7 @@ foreach file {
    mutex_noop.c
    mutex_unix.c
    mutex_w32.c
+   mutex_rtt.c
    malloc.c
    printf.c
    random.c
@@ -257,6 +258,7 @@ foreach file {
 
    os_unix.c
    os_win.c
+   os_rtt.c
 
    bitvec.c
    pcache.c