Small fixes:

- Documenting CONFIG+=
- Changed back msys2 download to an older version, the current one had bugs

build_scripts/Windows-msys2/build/build-webui.bat

@@ -7,8 +7,6 @@ call "%~dp0..\env.bat"
 if errorlevel 1 goto error_env
 call "%EnvPath%\env.bat"
 if errorlevel 1 goto error_env
-call "%EnvPath%\env.bat"
-if errorlevel 1 goto error_env
 call "%EnvPath%\env-msys2.bat"
 if errorlevel 1 goto error_env
 

build_scripts/Windows-msys2/build/env-base.bat

@@ -108,7 +108,7 @@ exit /B 0
 
 :usage
 echo.
-echo Usage: 32^|64 release^|debug [autologin plugins webui singlethread clang indexing noupdate]
+echo Usage: 32^|64 release^|debug [autologin plugins webui singlethread clang indexing noupdate] ["CONFIG+=..."]
 echo.
 echo Mandatory parameter
 echo 32^|64              32-bit or 64-bit Version
@@ -122,6 +122,7 @@ echo singlethread       Use only 1 thread for building
 echo clang              Use clang compiler instead of GCC
 echo indexing           Build with deep channel and file indexing support
 echo noupdate           Skip updating the libraries
+echo "CONFIG+=..."      Enable some extra features, you can find the almost complete list in retroshare.pri
 echo.
 echo Parameter for pack
 echo tor                Pack tor version

build_scripts/Windows-msys2/env/tools/prepare-msys2.bat

@@ -25,7 +25,7 @@ if exist "%EnvMSYS2Path%\msys%MSYS2Base%\usr\bin\pacman.exe" (
 	)
 )
 
-set MSYS2Install=msys2-base-%MSYS2Architecture%-20190524.tar.xz
+set MSYS2Install=msys2-base-%MSYS2Architecture%-20180531.tar.xz
 set MSYS2Url=http://sourceforge.net/projects/msys2/files/Base/%MSYS2Architecture%/%MSYS2Install%/download
 
 %cecho% info "Remove previous MSYS2 version"