Delete Makefile since it was replaced by cmake

Makefile

@@ -1,54 +0,0 @@
-#
-# **************************************************************
-# *         C++ Mathematical Expression Toolkit Library        *
-# *                                                            *
-# * Author: Arash Partow (1999-2023)                           *
-# * URL: https://www.partow.net/programming/exprtk/index.html  *
-# *                                                            *
-# * Copyright notice:                                          *
-# * Free use of the Mathematical Expression Toolkit Library is *
-# * permitted under the guidelines and in accordance with the  *
-# * most current version of the MIT License.                   *
-# * http://www.opensource.org/licenses/MIT                     *
-# *                                                            *
-# **************************************************************
-#
-
-
-COMPILER         := -c++
-#COMPILER        := -clang++
-OPTIMIZATION_OPT := -O1
-BASE_OPTIONS     := -pedantic-errors -Wall -Wextra -Werror -Wno-long-long
-OPTIONS          := $(BASE_OPTIONS) $(OPTIMIZATION_OPT)
-LINKER_OPT       := -L/usr/lib -lstdc++ -lm
-ASAN_OPT         := -g -fsanitize=address   -fno-omit-frame-pointer
-MSAN_OPT         := -g -fsanitize=memory    -fno-omit-frame-pointer
-LSAN_OPT         := -g -fsanitize=leak      -fno-omit-frame-pointer
-USAN_OPT         := -g -fsanitize=undefined -fno-omit-frame-pointer
-BUILD_SRC        := $(sort $(wildcard exprtk_*.cpp))
-BUILD_LIST       := $(BUILD_SRC:%.cpp=%)
-
-
-all: $(BUILD_LIST)
-
-$(BUILD_LIST) : %: %.cpp exprtk.hpp
-	$(COMPILER) $(OPTIONS) -o $@ $@.cpp $(LINKER_OPT)
-
-strip_bin :
-	@for f in $(BUILD_LIST); do if [ -f $$f ]; then strip -s $$f; echo $$f; fi done;
-
-valgrind :
-	@for f in $(BUILD_LIST); do \
-		if [ -f $$f ]; then \
-			cmd="valgrind --leak-check=full --show-reachable=yes --track-origins=yes --log-file=$$f.log -v ./$$f"; \
-			echo $$cmd; \
-			$$cmd; \
-		fi done;
-
-pgo: exprtk_benchmark.cpp exprtk.hpp
-	$(COMPILER) $(BASE_OPTIONS) -O3 -march=native -fprofile-generate -o exprtk_benchmark exprtk_benchmark.cpp $(LINKER_OPT)
-	./exprtk_benchmark
-	$(COMPILER) $(BASE_OPTIONS) -O3 -march=native -fprofile-use -o exprtk_benchmark exprtk_benchmark.cpp $(LINKER_OPT)
-
-clean:
-	rm -f core.* *~ *.o *.bak *stackdump gmon.out *.gcda *.gcno *.gcnor *.gch