Update sqlite to 3.7.3.

third_party/sqlite/src/ext/fts2/fts2.c

Index: third_party/sqlite/src/ext/fts2/fts2.c
diff --git a/third_party/sqlite/src/ext/fts2/fts2.c b/third_party/sqlite/src/ext/fts2/fts2.c
index ec4c108914b378b987be4178d82235e30e10bd46..5ec12659e0fb62434432f653315a2db3288437b9 100644
--- a/third_party/sqlite/src/ext/fts2/fts2.c
+++ b/third_party/sqlite/src/ext/fts2/fts2.c
@@ -320,8 +320,6 @@
 #include <stdlib.h>
 #include <stdio.h>
 #include <string.h>
-#include <ctype.h>
-
 #include "fts2.h"
 #include "fts2_hash.h"
 #include "fts2_tokenizer.h"
@@ -369,13 +367,13 @@ static int fts2Corrupt(void){
 */
 /* TODO(shess) Is __isascii() a portable version of (c&0x80)==0? */
 static int safe_isspace(char c){
-  return (c&0x80)==0 ? isspace(c) : 0;
+  return c==' ' || c=='\t' || c=='\n' || c=='\r' || c=='\v' || c=='\f';
 }
 static int safe_tolower(char c){
-  return (c>='A' && c<='Z') ? (c-'A'+'a') : c;
+  return (c>='A' && c<='Z') ? (c - 'A' + 'a') : c;
 }
 static int safe_isalnum(char c){
-  return (c&0x80)==0 ? isalnum(c) : 0;
+  return (c>='0' && c<='9') || (c>='A' && c<='Z') || (c>='a' && c<='z');
 }
 
 typedef enum DocListType {