[Vulkan] Fix compilation of vulkan-shaders-gen on w64devkit after e31a4f6 (ggml-org#8880)

* Fix compilation issue in `vulkan-shaders-gen`

ggml-org@e31a4f6 broke compilation on w64devkit. Including `algorithm` seems to fix that.

* Guard it under `#ifdef _WIN32`

Author: MaggotHATE

ggml/src/vulkan-shaders/vulkan-shaders-gen.cpp

@@ -22,6 +22,7 @@
 #ifdef _WIN32
     #include <windows.h>
     #include <direct.h> // For _mkdir on Windows
+    #include <algorithm> // For std::replace on w64devkit
 #else
     #include <unistd.h>
     #include <sys/wait.h>