make : remove make in favor of CMake (ggml-org#15449)

This commit removes the content from the Makefile and updates the
current deprecation message to information that `make` has been
replaced by CMake instead.

The message when `make` is invoked will now be the following:
```console
$ make
Makefile:6: *** Build system changed:
 The Makefile build has been replaced by CMake.

 For build instructions see:
 https://github.com/ggml-org/llama.cpp/blob/master/docs/build.md

.  Stop.
```

The motivation for this is that many, if not all targets fail to build
now, after changes to the system, and `make` has also been deprected for
some time now.

Author: danbev

Makefile

@@ -1,3 +1,4 @@
+<<<<<<< HEAD
 # Makefile for Cortex llamacpp engine - Build, Lint, Test, and Clean
 
 CMAKE_EXTRA_FLAGS ?= ""
@@ -74,4 +75,15 @@ else ifeq ($(shell uname -s),Linux)
 	@tar -czvf llama.tar.gz build/bin;
 else
 	@tar -czvf llama.tar.gz build/bin;
-endif
+endif
+=======
+define newline
+
+
+endef
+
+$(error Build system changed:$(newline)\
+The Makefile build has been replaced by CMake.$(newline)$(newline)\
+For build instructions see:$(newline)\
+https://github.com/ggml-org/llama.cpp/blob/master/docs/build.md$(newline)${newline})
+>>>>>>> 37f10f95 (make : remove make in favor of CMake (#15449))