Add the SQLITE_STATUS_MALLOC_COUNT option for sqlite3_status().

FossilOrigin-Name: 8f8e442b3af553753e25c304efa289b626e3a227
diff --git a/src/sqlite.h.in b/src/sqlite.h.in
index 89bcf1c..0c71848 100644
--- a/src/sqlite.h.in
+++ b/src/sqlite.h.in
@@ -5204,6 +5204,7 @@
 #define SQLITE_STATUS_PARSER_STACK         6
 #define SQLITE_STATUS_PAGECACHE_SIZE       7
 #define SQLITE_STATUS_SCRATCH_SIZE         8
+#define SQLITE_STATUS_MALLOC_COUNT         9
 
 /*
 ** CAPI3REF: Database Connection Status