spm : add ggml headers

Package.swift

@@ -17,7 +17,17 @@ let package = Package(
         .target(
             name: "llama",
             path: ".",
-            exclude: ["ggml-metal.metal"],
+            exclude: [
+               "cmake",
+               "examples",
+               "scripts",
+               "models",
+               "tests",
+               "CMakeLists.txt",
+               "ggml-cuda.cu",
+               "ggml-cuda.h",
+               "Makefile"
+            ],
             sources: [
                 "ggml.c",
                 "llama.cpp",

spm-headers/ggml-alloc.h

@@ -0,0 +1 @@
+../ggml-alloc.h

spm-headers/ggml-backend.h

@@ -0,0 +1 @@
+../ggml-backend.h

spm-headers/ggml.h

@@ -0,0 +1 @@
+../ggml.h