mesa: call FLUSH_VERTICES() before deleting shaders, buffers, query objects

Need to flush rendering (or at least indicate that the rug might be getting
pulled out from underneath us) when a shader, buffer object or query object
is about to be deleted.

Also, this helps to tell the VBO module to unmap its current vertex buffer.

src/mesa/main/bufferobj.c

@@ -749,6 +749,7 @@ _mesa_DeleteBuffersARB(GLsizei n, const GLuint *ids)
    GET_CURRENT_CONTEXT(ctx);
    GLsizei i;
    ASSERT_OUTSIDE_BEGIN_END(ctx);
+   FLUSH_VERTICES(ctx, 0);
 
    if (n < 0) {
       _mesa_error(ctx, GL_INVALID_VALUE, "glDeleteBuffersARB(n)");

src/mesa/main/queryobj.c

@@ -218,6 +218,7 @@ _mesa_DeleteQueriesARB(GLsizei n, const GLuint *ids)
    GLint i;
    GET_CURRENT_CONTEXT(ctx);
    ASSERT_OUTSIDE_BEGIN_END(ctx);
+   FLUSH_VERTICES(ctx, 0);
 
    if (MESA_VERBOSE & VERBOSE_API)
       _mesa_debug(ctx, "glDeleeteQueries(%d)\n", n);

src/mesa/main/shaderapi.c

@@ -1236,6 +1236,7 @@ _mesa_DeleteObjectARB(GLhandleARB obj)
 
    if (obj) {
       GET_CURRENT_CONTEXT(ctx);
+      FLUSH_VERTICES(ctx, 0);
       if (is_program(ctx, obj)) {
          delete_shader_program(ctx, obj);
       }
@@ -1254,6 +1255,7 @@ _mesa_DeleteProgram(GLuint name)
 {
    if (name) {
       GET_CURRENT_CONTEXT(ctx);
+      FLUSH_VERTICES(ctx, 0);
       delete_shader_program(ctx, name);
    }
 }
@@ -1264,6 +1266,7 @@ _mesa_DeleteShader(GLuint name)
 {
    if (name) {
       GET_CURRENT_CONTEXT(ctx);
+      FLUSH_VERTICES(ctx, 0);
       delete_shader(ctx, name);
    }
 }