Workaround for a valgrind warning  on 64-bit systems.
Workaround for a valgrind warning  on 64-bit systems.

Workaround a valgrind warning in strtod on 64 bit systems.

On 64-bit systems, strtod uses an optimized version of
strcasecmp to find out whether or not a string represents
a number.

This version uses int (8 byte) comparison. If the string
in turn is less than 8 bytes, or is not aligned around 8 byte
boundary, uninitialized memory can be accessed.

Work this around with a simple test (this is lame and
incomplete, but covers our cases. In future either
this in valgrind will be gone, or our code will change,
or we add a suppression).

Sannis/tarantool,condor-the-bird/tarantool,mejedi/tarantool,KlonD90/tarantool,rtsisyk/tarantool,KlonD90/tarantool,vasilenkomike/tarantool,mejedi/tarantool,nvoron23/tarantool,dkorolev/tarantool,guard163/tarantool,vasilenkomike/tarantool,nvoron23/tarantool,condor-the-bird/tarantool,dkorolev/tarantool,KlonD90/tarantool,ocelot-inc/tarantool,nvoron23/tarantool,condor-the-bird/tarantool,nvoron23/tarantool,condor-the-bird/tarantool,guard163/tarantool,nvoron23/tarantool,rtsisyk/tarantool,Sannis/tarantool,KlonD90/tarantool,Sannis/tarantool,ocelot-inc/tarantool,mejedi/tarantool,guard163/tarantool,vasilenkomike/tarantool,mejedi/tarantool,guard163/tarantool,guard163/tarantool,Sannis/tarantool,KlonD90/tarantool,nvoron23/tarantool,dkorolev/tarantool,condor-the-bird/tarantool,ocelot-inc/tarantool,rtsisyk/tarantool,ocelot-inc/tarantool,Sannis/tarantool,dkorolev/tarantool,dkorolev/tarantool,vasilenkomike/tarantool,vasilenkomike/tarantool,rtsisyk/tarantool