Replace SDL types by C99 standard types

Scrcpy is a C11 project. Use the C99 standard types instead of the
SDL-specific types:

    SDL_bool -> bool
    SintXX   -> intXX_t
    UintXX   -> uintXX_t

app/src/sys/unix/command.c

@@ -73,7 +73,7 @@ end:
     return ret;
 }
 
-SDL_bool
+bool
 cmd_terminate(pid_t pid) {
     if (pid <= 0) {
         LOGC("Requested to kill %d, this is an error. Please report the bug.\n",
@@ -83,7 +83,7 @@ cmd_terminate(pid_t pid) {
     return kill(pid, SIGTERM) != -1;
 }
 
-SDL_bool
+bool
 cmd_simple_wait(pid_t pid, int *exit_code) {
     int status;
     int code;

app/src/sys/unix/net.c

@@ -1,11 +1,11 @@
 #include "net.h"
 
-# include <unistd.h>
+#include <unistd.h>
 
-SDL_bool
+bool
 net_init(void) {
     // do nothing
-    return SDL_TRUE;
+    return true;
 }
 
 void
@@ -13,7 +13,7 @@ net_cleanup(void) {
     // do nothing
 }
 
-SDL_bool
+bool
 net_close(socket_t socket) {
     return !close(socket);
 }

app/src/sys/win/command.c

@@ -57,12 +57,12 @@ cmd_execute(const char *path, const char *const argv[], HANDLE *handle) {
     return PROCESS_SUCCESS;
 }
 
-SDL_bool
+bool
 cmd_terminate(HANDLE handle) {
     return TerminateProcess(handle, 1) && CloseHandle(handle);
 }
 
-SDL_bool
+bool
 cmd_simple_wait(HANDLE handle, DWORD *exit_code) {
     DWORD code;
     if (WaitForSingleObject(handle, INFINITE) != WAIT_OBJECT_0

app/src/sys/win/net.c

@@ -2,15 +2,15 @@
 
 #include "log.h"
 
-SDL_bool
+bool
 net_init(void) {
     WSADATA wsa;
     int res = WSAStartup(MAKEWORD(2, 2), &wsa) < 0;
     if (res < 0) {
         LOGC("WSAStartup failed with error %d", res);
-        return SDL_FALSE;
+        return false;
     }
-    return SDL_TRUE;
+    return true;
 }
 
 void
@@ -18,7 +18,7 @@ net_cleanup(void) {
     WSACleanup();
 }
 
-SDL_bool
+bool
 net_close(socket_t socket) {
     return !closesocket(socket);
 }