fix: Remove unnecessary Vulkan library linkage in CMakeLists.txt

Since `vulkan-shader-gen.cpp` only requires the `glslc` executable
and not the Vulkan headers or libraries, CMakeLists.txt needs to
be corrected.
(See: ecc93d0)

ggml/src/ggml-vulkan/vulkan-shaders/CMakeLists.txt

@@ -1,9 +1,11 @@
 find_package (Threads REQUIRED)
-find_package(Vulkan COMPONENTS glslc REQUIRED)
+find_program(GLSLC_EXECUTABLE glslc)
+if(NOT GLSLC_EXECUTABLE)
+    message(FATAL_ERROR "glslc not found.")
+endif()
 
 set(TARGET vulkan-shaders-gen)
 add_executable(${TARGET} vulkan-shaders-gen.cpp)
 install(TARGETS ${TARGET} RUNTIME)
 target_compile_features(${TARGET} PRIVATE cxx_std_17)
 target_link_libraries(vulkan-shaders-gen PUBLIC Threads::Threads)
-target_link_libraries(vulkan-shaders-gen PRIVATE Vulkan::Vulkan)

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

@@ -30,8 +30,6 @@
     #include <fcntl.h>
 #endif
 
-#include <vulkan/vulkan_core.h>
-
 #define ASYNCIO_CONCURRENCY 64
 
 std::mutex lock;