layers: Fix Windows build

STL min/max functions were causing windows build failures.

Change-Id: Ia153a5d6a3d245b645b5f829c3f076c023d865f1
diff --git a/layers/descriptor_sets.cpp b/layers/descriptor_sets.cpp
index 142f1ef..eef6567 100644
--- a/layers/descriptor_sets.cpp
+++ b/layers/descriptor_sets.cpp
@@ -25,6 +25,7 @@
 #include "vk_enum_string_helper.h"
 #include "vk_safe_struct.h"
 #include <sstream>
+#include <algorithm>
 
 // Construct DescriptorSetLayout instance from given create info
 cvdescriptorset::DescriptorSetLayout::DescriptorSetLayout(const VkDescriptorSetLayoutCreateInfo *p_create_info,