Windows builds are missing libwinpthread-1.dll

[xyzz]

As a result, they don't work at all.

---------------------------
arm-vita-eabi-gcc-6.2.0.exe - System Error
---------------------------
The program can't start because libwinpthread-1.dll is missing from your computer. Try reinstalling the program to fix this problem. 
---------------------------
OK   
---------------------------

Worked around on msys2 by using mingw64 and installing the mingw64/mingw-w64-x86_64-libwinpthread-git package.

[devnoname120]

@codestation How can we statically link these libraries for the Windows build?

[codestation]

libwinpthread-1.dll isn't linked when built using Ubuntu Xenial (16.04 LTS). It is possible switch to the xenial image on travis?

I built the sdk twice on a trusty and xenial docker image to confirm, ldd output below:

Built using ubuntu:xenial

$ ldd xenial/bin/arm-vita-eabi-gcc-6.2.0.exe
        ntdll.dll => /c/Windows/SYSTEM32/ntdll.dll (0x76fd0000)
        kernel32.dll => /c/Windows/system32/kernel32.dll (0x76eb0000)
        KERNELBASE.dll => /c/Windows/system32/KERNELBASE.dll (0x7fefcd50000)
        ADVAPI32.dll => /c/Windows/system32/ADVAPI32.dll (0x7fefe940000)
        msvcrt.dll => /c/Windows/system32/msvcrt.dll (0x7feff240000)
        sechost.dll => /c/Windows/SYSTEM32/sechost.dll (0x7fefe770000)
        RPCRT4.dll => /c/Windows/system32/RPCRT4.dll (0x7fefea20000)
        USER32.dll => /c/Windows/system32/USER32.dll (0x76db0000)
        GDI32.dll => /c/Windows/system32/GDI32.dll (0x7fefe790000)
        LPK.dll => /c/Windows/system32/LPK.dll (0x7fefd600000)
        USP10.dll => /c/Windows/system32/USP10.dll (0x7fefe5c0000)

Built using ubuntu:trusty

$ ldd trusty/bin/arm-vita-eabi-gcc-6.2.0.exe
        ntdll.dll => /c/Windows/SYSTEM32/ntdll.dll (0x76fd0000)
        kernel32.dll => /c/Windows/system32/kernel32.dll (0x76eb0000)
        KERNELBASE.dll => /c/Windows/system32/KERNELBASE.dll (0x7fefcd50000)
        ADVAPI32.dll => /c/Windows/system32/ADVAPI32.dll (0x7fefe940000)
        msvcrt.dll => /c/Windows/system32/msvcrt.dll (0x7feff240000)
        sechost.dll => /c/Windows/SYSTEM32/sechost.dll (0x7fefe770000)
        RPCRT4.dll => /c/Windows/system32/RPCRT4.dll (0x7fefea20000)
        libwinpthread-1.dll => /mingw64/bin/libwinpthread-1.dll (0x64940000)
        USER32.dll => /c/Windows/system32/USER32.dll (0x76db0000)
        GDI32.dll => /c/Windows/system32/GDI32.dll (0x7fefe790000)
        LPK.dll => /c/Windows/system32/LPK.dll (0x7fefd600000)
        USP10.dll => /c/Windows/system32/USP10.dll (0x7fefe5c0000)

[devnoname120]

Unfortunately, Travis doesn't support Ubuntu Xenial. We could use a Docker container but in addition to the increased complexity for maintenance, our builds are already often timing out so it would be even worse with Docker.

I wonder if there is another way to avoid this dependency.

[devnoname120]

@codestation Note that since then Travis-CI has increased the maximum running time of vitasdk/autobuilds to 90 minutes. Building in a Ubuntu Xenial container should not time out.

[devnoname120]

Note that Travis-CI now supports Ubuntu Xenial. Statically linking pthread and removing the DLLs would fix issues such as #63.