video: Rename SDL_GL_DeleteContext to SDL_GL_DestroyContext.

Turns out that there isn't a strong OpenGL naming convention for "Delete" ...
WGL offers "wglDeleteContext" but the GLX equivalent is "glxDestroyContext"
and then EGL sealed the deal by going with Destroy as well! Since it matches
SDL3 naming conventions (Create/Destroy), we're renaming it.

Fixes #10197.

src/render/opengl/SDL_render_gl.c

@@ -1578,7 +1578,7 @@ static void GL_DestroyRenderer(SDL_Renderer *renderer)
                 SDL_free(data->framebuffers);
                 data->framebuffers = nextnode;
             }
-            SDL_GL_DeleteContext(data->context);
+            SDL_GL_DestroyContext(data->context);
         }
         SDL_free(data);
     }
@@ -1686,12 +1686,12 @@ static int GL_CreateRenderer(SDL_Renderer *renderer, SDL_Window *window, SDL_Pro
         goto error;
     }
     if (SDL_GL_MakeCurrent(window, data->context) < 0) {
-        SDL_GL_DeleteContext(data->context);
+        SDL_GL_DestroyContext(data->context);
         goto error;
     }
 
     if (GL_LoadFunctions(data) < 0) {
-        SDL_GL_DeleteContext(data->context);
+        SDL_GL_DestroyContext(data->context);
         goto error;
     }
 
@@ -1807,7 +1807,7 @@ static int GL_CreateRenderer(SDL_Renderer *renderer, SDL_Window *window, SDL_Pro
             SDL_GL_GetProcAddress("glCheckFramebufferStatusEXT");
     } else {
         SDL_SetError("Can't create render targets, GL_EXT_framebuffer_object not available");
-        SDL_GL_DeleteContext(data->context);
+        SDL_GL_DestroyContext(data->context);
         goto error;
     }
 

src/render/opengles2/SDL_render_gles2.c

@@ -1440,7 +1440,7 @@ static void GLES2_DestroyRenderer(SDL_Renderer *renderer)
             GL_CheckError("", renderer);
 #endif
 
-            SDL_GL_DeleteContext(data->context);
+            SDL_GL_DestroyContext(data->context);
         }
 
         SDL_free(data);
@@ -2107,17 +2107,17 @@ static int GLES2_CreateRenderer(SDL_Renderer *renderer, SDL_Window *window, SDL_
         goto error;
     }
     if (SDL_GL_MakeCurrent(window, data->context) < 0) {
-        SDL_GL_DeleteContext(data->context);
+        SDL_GL_DestroyContext(data->context);
         goto error;
     }
 
     if (GLES2_LoadFunctions(data) < 0) {
-        SDL_GL_DeleteContext(data->context);
+        SDL_GL_DestroyContext(data->context);
         goto error;
     }
 
     if (GLES2_CacheShaders(data) < 0) {
-        SDL_GL_DeleteContext(data->context);
+        SDL_GL_DestroyContext(data->context);
         goto error;
     }