WinRT: fixed bug whereby SDL would override an app's default orientation

WinRT apps can set a default, preferred orientation via a .appxmanifest file.
SDL was overriding this on app startup, and making the app use all possible
orientations (landscape and portrait).

Thanks to Eric Wing for the heads up on this!

visualtest/src/linux/linux_process.c

@@ -0,0 +1,199 @@
+/* See COPYING.txt for the full license governing this code. */
+/**
+ *  \file linux_process.c
+ * 
+ *  Source file for the process API on linux.
+ */
+
+
+#include <SDL.h>
+#include <SDL_test.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <unistd.h>
+#include <errno.h>
+
+#include "SDL_visualtest_process.h"
+#include "SDL_visualtest_harness_argparser.h"
+#include "SDL_visualtest_parsehelper.h"
+
+#if defined(__LINUX__)
+
+static void
+LogLastError(char* str)
+{
+    char* error = (char*)strerror(errno);
+    if(!str || !error)
+    	return;
+    SDLTest_LogError("%s: %s", str, error);
+}
+
+int
+SDL_LaunchProcess(char* file, char* args, SDL_ProcessInfo* pinfo)
+{
+    pid_t pid;
+    char** argv;
+
+    if(!file)
+    {
+        SDLTest_LogError("file argument cannot be NULL");
+        return 0;
+    }
+    if(!pinfo)
+    {
+        SDLTest_LogError("pinfo cannot be NULL");
+        return 0;
+    }
+    pid = fork();
+    if(pid == -1)
+    {
+        LogLastError("fork() failed");
+        return 0;
+    }
+    else if(pid == 0)
+    {
+        /* parse the arguments string */
+        argv = SDLVisualTest_ParseArgsToArgv(args);
+        argv[0] = file;
+        execv(file, argv);
+        LogLastError("execv() failed");
+        return 0;
+    }
+    else
+    {
+        pinfo->pid = pid;
+        return 1;
+    }
+
+    /* never executed */
+    return 0;
+}
+
+int
+SDL_GetProcessExitStatus(SDL_ProcessInfo* pinfo, SDL_ProcessExitStatus* ps)
+{
+    int success, status;
+    if(!pinfo)
+    {
+        SDLTest_LogError("pinfo argument cannot be NULL");
+        return 0;
+    }
+    if(!ps)
+    {
+        SDLTest_LogError("ps argument cannot be NULL");
+        return 0;
+    }
+    success = waitpid(pinfo->pid, &status, WNOHANG);
+    if(success == -1)
+    {
+        LogLastError("waitpid() failed");
+        return 0;
+    }
+    else if(success == 0)
+    {
+        ps->exit_status = -1;
+        ps->exit_success = 1;
+    }
+    else
+    {
+        ps->exit_success = WIFEXITED(status);
+        ps->exit_status = WEXITSTATUS(status);
+    }
+    return 1;
+}
+
+int
+SDL_IsProcessRunning(SDL_ProcessInfo* pinfo)
+{
+    int success;
+
+    if(!pinfo)
+    {
+        SDLTest_LogError("pinfo cannot be NULL");
+        return -1;
+    }
+
+    success = kill(pinfo->pid, 0);
+    if(success == -1)
+    {
+        if(errno == ESRCH) /* process is not running */
+            return 0;
+        else
+        {
+            LogLastError("kill() failed");
+            return -1;
+        }
+    }
+    return 1;
+}
+
+int
+SDL_QuitProcess(SDL_ProcessInfo* pinfo, SDL_ProcessExitStatus* ps)
+{
+    int success, status;
+
+    if(!pinfo)
+    {
+        SDLTest_LogError("pinfo argument cannot be NULL");
+        return 0;
+    }
+    if(!ps)
+    {
+        SDLTest_LogError("ps argument cannot be NULL");
+        return 0;
+    }
+
+    success = kill(pinfo->pid, SIGQUIT);
+    if(success == -1)
+    {
+        LogLastError("kill() failed");
+        return 0;
+    }
+
+    success = waitpid(pinfo->pid, &status, 0);
+    if(success == -1)
+    {
+        LogLastError("waitpid() failed");
+        return 0;
+    }
+
+    ps->exit_success = WIFEXITED(status);
+    ps->exit_status = WEXITSTATUS(status);
+    return 1;
+}
+
+int
+SDL_KillProcess(SDL_ProcessInfo* pinfo, SDL_ProcessExitStatus* ps)
+{
+    int success, status;
+
+    if(!pinfo)
+    {
+        SDLTest_LogError("pinfo argument cannot be NULL");
+        return 0;
+    }
+    if(!ps)
+    {
+        SDLTest_LogError("ps argument cannot be NULL");
+        return 0;
+    }
+
+    success = kill(pinfo->pid, SIGKILL);
+    if(success == -1)
+    {
+        LogLastError("kill() failed");
+        return 0;
+    }
+    success = waitpid(pinfo->pid, &status, 0);
+    if(success == -1)
+    {
+        LogLastError("waitpid() failed");
+        return 0;
+    }
+
+    ps->exit_success = WIFEXITED(status);
+    ps->exit_status = WEXITSTATUS(status);
+    return 1;
+}
+
+#endif