Use sizeof(void*) instead of mrb_int size and extend embed string size.

two pool fixes

support linenoise in mirb

C4146 (unary minus operator applied to unsigned type, result still
unsigned)

Embed small string

.PHONY should be placed after `all'

Fix behavior Hash#eql?

Because some make (e.g. nmake) recognize it as a normal rule definition and if it's the first rule, make runs it as a default rule.
Consequently `all', `test' and `clean' are all ran (because they are depended by .PHONY), and builded files are cleaned.

use flags 4 for *this object is embed*
use flags 8~64 for *embed string length*

Fix build on mingw32

fixed broken gettimeofday implementation for Windows

small, but critical typo :)

Fix and add test for Proc#source_location.

visualcpp toolchain: change compiler/linker flags

error.h: add extern "C" for C++

with these flags visualcpp should behave more like the gcc toolchain

c:
- produce debug information
- optimize for speed instead of disabling optimization
- use non-debug version of Microsoft's C library
- remove unused and unnecessary macro definitions
cxx:
- separate C and C++ (#1594)
- specify kind of exception handling (see warning C4530)
linker:
- produce debug information
- disable incremental linking and re-enable optimizations

__FILE__ test: add support for \ as separator

mruby-time: add gettimeofday(2) for Windows

mruby-time: various smaller changes