New beta release of the PSP Emulator

PPSSPP Git (2018/04/15) is compiled. PPSSPP is a fast and portable PSP emulator for Android, Windows, Mac, and Linux, written in C++.

PPSSPP Git Changelog:
* Merge pull request #10918 from unknownbrackets/vulkan-shutdown
* Vulkan: Fix shutdown crash when device lost called.
* Merge pull request #10915 from unknownbrackets/warnings
* Android: Avoid overload shadowing.
* GLES: GlPushBuffer was a little too friendly.
* Vulkan: Fix cache file error handling warnings.
* Vulkan: Fix a log formatting issue.