Convert mju_error and mju_warning to variadic functions, supporting printf-like arguments. The functions mju_error_i, mju_error_s, mju_warning_i, and mju_warning_s are now deprecated.

PiperOrigin-RevId: 515431052
Change-Id: I440de0cb417ce216b6d636a5d86dc9ef6cc1fc06

src/render/glad/glad.c

@@ -199,7 +199,7 @@ static int mjGlad_open_gl(void) {
 
   handle = dlopen(libname, RTLD_NOW | RTLD_LOCAL);
   if (!handle) {
-    mju_error_s("failed to dlopen %s", libname);
+    mju_error("failed to dlopen %s", libname);
   }
 
   if (platform == mjGL_GLX) {