Fix SDL2 building under Termux

This is pretty much a hack.

1. Updated config.guess and config.sub for SDLnet to the latest version, making SDLnet building work.
2. Code patches mostly are about NDK and toolchain (mine is clang) oddities.

Running build-debug-sdl2 without parameters now succeed.
src/dosbox-x runs.
This may break building for other platforms, so please check.

Signed-off-by: Liu Wenyuan <15816141883@163.com>

src/cpu/dynamic_alloc_common.h

@@ -4,7 +4,7 @@
 /* Define temporary pagesize so the MPROTECT case and the regular case share as much code as possible */
 #if (C_HAVE_MPROTECT)
 #define PAGESIZE_TEMP PAGESIZE
-#else 
+#else
 #define PAGESIZE_TEMP 4096
 #endif
 
@@ -74,7 +74,8 @@ static void cache_dynamic_common_alloc(Bitu allocsz) {
         else cache_code_start_ptr = NULL; /* MAP_FAILED is NOT NULL (or at least we cannot assume that) */
     }
 #endif
-#if defined(C_HAVE_MEMFD_CREATE) /* Try a Linux memfd which we can mmap twice, one read/write, one read/execute */
+#if defined(C_HAVE_MEMFD_CREATE) && !defined(__ANDROID__) /* Try a Linux memfd which we can mmap twice, one read/write, one read/execute */
+/** NTS: Android NDK doesn't really have memfd_create, but automake claims so? **/
     if (cache_code_start_ptr == NULL) {
         assert(cache_fd < 0);
         cache_fd = memfd_create("dosbox-dynamic-core-cache",MFD_CLOEXEC);

src/dos/dos_programs.cpp

@@ -6446,7 +6446,7 @@ bool AUTOTYPE::ReadDoubleArg(const std::string &name,
 	if (cmd->FindString(flag, str_value, true)) {
 		// Can the user's value be parsed?
 		const double user_value = to_finite<double>(str_value);
-#if defined(MACOSX) || defined(EMSCRIPTEN)
+#if defined(MACOSX) || defined(EMSCRIPTEN) || (defined(__ANDROID__) && defined(__clang__))
 		if (isfinite(user_value)) { /* *sigh* Really, clang, really? */
 #else
 		if (std::isfinite(user_value)) {

src/fpu/fpu_instructions_longdouble.h

@@ -22,7 +22,7 @@
 #ifdef __GNUC__
 # if defined(__MINGW32__) || (defined(MACOSX) && !defined(__arm64__))
 #  include "fpu_control_x86.h"
-# elif (defined(MACOSX) && defined(__arm64__)) || defined(EMSCRIPTEN)
+# elif defined(__ANDROID__) || (defined(MACOSX) && defined(__arm64__)) || defined(EMSCRIPTEN)
 /* ? */
 #  define _FPU_SETCW(x) /* dummy */
 # else

src/misc/programs.cpp

@@ -582,6 +582,11 @@ void CONFIG::Run(void) {
 		"-get", "-set", "-setf",
 		"-writelang", "-wl", "-langname", "-ln",
 		"-securemode", "-setup", "-all", "-mod", "-norem", "-errtest", "-gui", NULL };
+/* HACK: P_ALL is in linux/wait.h */
+#if defined(P_ALL)
+#define __P_ALL P_ALL
+#undef P_ALL
+#endif
 	enum prs {
 		P_NOMATCH, P_NOPARAMS, // fixed return values for GetParameterFromList
 		P_RESTART,
@@ -617,6 +622,9 @@ void CONFIG::Run(void) {
 		case P_ALL:
 			if (all<1) all = 1;
 			break;
+#if defined(__P_ALL)
+#define P_ALL __P_ALL
+#endif
 
 		case P_MOD:
 			if (all==-1) all = 0;

src/misc/regionalloctracking.cpp

@@ -22,7 +22,10 @@
 #include "regionalloctracking.h"
 #include "parport.h"
 #include <time.h>
+#if !defined(__ANDROID__)
+/* NDK doesn't have this */
 #include <sys/timeb.h>
+#endif
 
 /* Really, Microsoft, Really?? You're the only compiler I know that doesn't understand ssize_t! */
 #if defined(_MSC_VER)