[sql] Import reference version of SQLite 3.7.6.3.

third_party/sqlite/sqlite-src-3070603/src/util.c

 /*
 ** 2001 September 15
 **
 ** The author disclaims copyright to this source code.  In place of
 ** a legal notice, here is a blessing:
 **
 **    May you do good and not evil.
 **    May you find forgiveness for yourself and forgive others.
 **    May you share freely, never taking more than you give.
 **
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 /*
 ** Compute the absolute value of a 32-bit signed integer, of possible.  Or 
 ** if the integer has a value of -2147483648, return +2147483647
 */
 int sqlite3AbsInt32(int x){
   if( x>=0 ) return x;
   if( x==(int)0x80000000 ) return 0x7fffffff;
   return -x;
 }