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

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

https://github.com/ggerganov/llama.cpp/commit/e31a4f679779220312c165b0f5994c680a610e38 broke compilation on w64devkit. Including `algorithm` seems to fix that.

* Guard it under `#ifdef _WIN32`

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>