cmake: add hints for locating ggml on Windows using Llama find-package (#11466)

cmake/llama-config.cmake.in

@@ -9,7 +9,7 @@ set_and_check(LLAMA_INCLUDE_DIR "@PACKAGE_LLAMA_INCLUDE_INSTALL_DIR@")
 set_and_check(LLAMA_LIB_DIR     "@PACKAGE_LLAMA_LIB_INSTALL_DIR@")
 set_and_check(LLAMA_BIN_DIR     "@PACKAGE_LLAMA_BIN_INSTALL_DIR@")
 
-find_package(ggml REQUIRED)
+find_package(ggml REQUIRED HINTS ${LLAMA_LIB_DIR}/cmake)
 
 find_library(llama_LIBRARY llama
     REQUIRED