Fix Coverity Scan false positive

src/cocoa_joystick.m

@@ -464,7 +464,7 @@ void _glfwPlatformUpdateGamepadGUID(char* guid)
         (strncmp(guid + 20, "000000000000", 12) == 0))
     {
         char original[33];
-        strcpy(original, guid);
+        strncpy(original, guid, sizeof(original) - 1);
         sprintf(guid, "03000000%.4s0000%.4s000000000000",
                 original, original + 16);
     }

src/input.c

@@ -436,7 +436,7 @@ _GLFWjoystick* _glfwAllocJoystick(const char* name,
     js->buttonCount = buttonCount;
     js->hatCount    = hatCount;
 
-    strcpy(js->guid, guid);
+    strncpy(js->guid, guid, sizeof(js->guid) - 1);
     js->mapping = findValidMapping(js);
 
     return js;

src/win32_joystick.c

@@ -745,7 +745,7 @@ void _glfwPlatformUpdateGamepadGUID(char* guid)
     if (strcmp(guid + 20, "504944564944") == 0)
     {
         char original[33];
-        strcpy(original, guid);
+        strncpy(original, guid, sizeof(original) - 1);
         sprintf(guid, "03000000%.4s0000%.4s000000000000",
                 original, original + 4);
     }