Update binaries

* C Compiler: i686-pc-mingw32-gcc 4.7.3
* SQLite: 3.8.2

Additionally, removed ex4 files from the source tree, because anyone can compile mq4 easily and ex4 binaries should not be managed in the source tree. Git detects "it is changed" even if ``make clean`` and ``make`` executed with unchanged mq4 sources.