fixed build rwops (#6818)

* Fixed build

test/testautomation_rwops.c

@@ -440,7 +440,7 @@ int rwops_testCompareRWFromMemWithRWFromFile(void)
         /* Read/seek from memory */
         rwops_mem = SDL_RWFromMem((void *)RWopsAlphabetString, slen);
         SDLTest_AssertPass("Call to SDL_RWFromMem()");
-        rv_mem = SDL_RWread(rwops_mem, buffer_mem, size * 6);
+        rv_mem = (size_t)SDL_RWread(rwops_mem, buffer_mem, size * 6);
         SDLTest_AssertPass("Call to SDL_RWread(mem, size=%d)", size * 6);
         sv_mem = SDL_RWseek(rwops_mem, 0, SEEK_END);
         SDLTest_AssertPass("Call to SDL_RWseek(mem,SEEK_END)");
@@ -451,7 +451,7 @@ int rwops_testCompareRWFromMemWithRWFromFile(void)
         /* Read/see from file */
         rwops_file = SDL_RWFromFile(RWopsAlphabetFilename, "r");
         SDLTest_AssertPass("Call to SDL_RWFromFile()");
-        rv_file = SDL_RWread(rwops_file, buffer_file, size * 6);
+        rv_file = (size_t)SDL_RWread(rwops_file, buffer_file, size * 6);
         SDLTest_AssertPass("Call to SDL_RWread(file, size=%d)", size * 6);
         sv_file = SDL_RWseek(rwops_file, 0, SEEK_END);
         SDLTest_AssertPass("Call to SDL_RWseek(file,SEEK_END)");

test/testime.c

@@ -145,7 +145,7 @@ static int unifont_init(const char *fontname)
         Uint8 glyphWidth;
         Uint32 codepoint;
 
-        bytesRead = SDL_RWread(hexFile, hexBuffer, 9);
+        bytesRead = (size_t)SDL_RWread(hexFile, hexBuffer, 9);
         if (numGlyphs > 0 && bytesRead == 0) {
             break; /* EOF */
         }
@@ -181,7 +181,7 @@ static int unifont_init(const char *fontname)
         if (codepointHexSize < 8) {
             SDL_memmove(hexBuffer, hexBuffer + codepointHexSize + 1, bytesOverread);
         }
-        bytesRead = SDL_RWread(hexFile, hexBuffer + bytesOverread, 33 - bytesOverread);
+        bytesRead = (size_t)SDL_RWread(hexFile, hexBuffer + bytesOverread, 33 - bytesOverread);
         if (bytesRead < (33 - bytesOverread)) {
             SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "unifont: Unexpected end of hex file.\n");
             return -1;
@@ -190,7 +190,7 @@ static int unifont_init(const char *fontname)
             glyphWidth = 8;
         } else {
             glyphWidth = 16;
-            bytesRead = SDL_RWread(hexFile, hexBuffer + 33, 32);
+            bytesRead = (size_t)SDL_RWread(hexFile, hexBuffer + 33, 32);
             if (bytesRead < 32) {
                 SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "unifont: Unexpected end of hex file.\n");
                 return -1;