NetBSD: fixed issues with cpuinfo and pthread_setname_np (thanks, Thomas!).

Fixes Bugzilla #3176.

src/cpuinfo/SDL_cpuinfo.c

@@ -735,7 +735,7 @@ SDL_GetSystemRAM(void)
 #endif
 #ifdef HAVE_SYSCTLBYNAME
         if (SDL_SystemRAM <= 0) {
-#if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
+#if defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__NetBSD__)
 #ifdef HW_REALMEM
             int mib[2] = {CTL_HW, HW_REALMEM};
 #else

src/thread/pthread/SDL_systhread.c

@@ -143,7 +143,11 @@ SDL_SYS_SetupThread(const char *name)
             #endif
         }
         #elif HAVE_PTHREAD_SETNAME_NP
+            #if defined(__NETBSD__)
+            pthread_setname_np(pthread_self(), "%s", name);
+            #else
             pthread_setname_np(pthread_self(), name);
+            #endif
         #elif HAVE_PTHREAD_SET_NAME_NP
             pthread_set_name_np(pthread_self(), name);
         #elif defined(__HAIKU__)