removed example compilation for rpi

Makefile

@@ -12,8 +12,7 @@ all:
 	@echo "  BUILD_TYPE- current value='${BUILD_TYPE}' used for CMAKE - either Release or Debug"
 	@echo ""
 	@echo "Targets:"
-	@echo "  example   - build example program"
-	@echo "  examplerpi- build example program for Raspberry Pi 3+"
+	@echo "  example   - build example programs"
 	@echo "  tests     - build tests and run"
 	@echo "  testcov   - build tests with coverage and run them"
 	@echo "  clean     - cleans build directory"
@@ -26,14 +25,6 @@ example:
 	@rm -f compile_commands.json
 	@ln -s build_$@_${BUILD_TYPE_LC}/compile_commands.json .
 
-examplerpi:
-	@cmake -S . -B build_rpi -G Ninja \
-		   --toolchain cmake/rpi.cmake \
-		   -DUSE_EXAMPLE=ON \
-		   -DUSE_TESTS=OFF \
-           -DCMAKE_BUILD_TYPE=Release
-	@cmake --build build_rpi
-
 tests:
 	@make TESTS=ON example
 	@./build_example_${BUILD_TYPE_LC}/options_tests