thirdparty: update all sokol and fontstash headers with their upstream versions (#16940)

vlib/sokol/sgl/sgl_allocator_and_logger.c.v

@@ -0,0 +1,18 @@
+module sgl
+
+import sokol.memory
+
+[typedef]
+pub struct C.sgl_allocator_t {
+pub mut:
+	alloc     memory.FnAllocatorAlloc
+	free      memory.FnAllocatorFree
+	user_data voidptr
+}
+
+[typedef]
+pub struct C.sgl_logger_t {
+pub mut:
+	log_cb    memory.FnLogCb
+	user_data voidptr
+}