build : fix llama.pc (#11658)

Signed-off-by: Adrien Gallouët <adrien@gallouet.fr>

CMakeLists.txt

@@ -233,4 +233,4 @@ configure_file(cmake/llama.pc.in
         @ONLY)
 
 install(FILES "${CMAKE_CURRENT_BINARY_DIR}/llama.pc"
-        DESTINATION lib/pkgconfig)
+        DESTINATION ${CMAKE_INSTALL_LIBDIR}/pkgconfig)

cmake/llama.pc.in

@@ -1,10 +1,10 @@
 prefix=@CMAKE_INSTALL_PREFIX@
-exec_prefix=${prefix}
-libdir=${exec_prefix}/lib
-includedir=${prefix}/include
+exec_prefix=@CMAKE_INSTALL_PREFIX@
+libdir=@CMAKE_INSTALL_FULL_LIBDIR@
+includedir=@CMAKE_INSTALL_FULL_INCLUDEDIR@
 
 Name: llama
 Description: Port of Facebook's LLaMA model in C/C++
-Version: @PROJECT_VERSION@
-Libs: -L${libdir} -lggml  -lggml-base -lllama
+Version: @LLAMA_INSTALL_VERSION@
+Libs: -L${libdir} -lggml -lggml-base -lllama
 Cflags: -I${includedir}