[Makefile] Drop unused targets

LibOS/shim/Makefile

@@ -3,10 +3,7 @@ MAKEFLAGS += --check-symlink-times
 SYS ?= $(shell gcc -dumpmachine)
 export SYS
 
-targets = all debug clean
-ifeq ($(findstring x86_64,$(SYS))$(findstring linux,$(SYS)),x86_64linux)
-targets += pack
-endif
+targets = all clean
 
 .PHONY: $(targets)
 $(targets):

Makefile

@@ -8,7 +8,3 @@ $(targets):
 	$(MAKE) -C Pal $@
 	$(MAKE) -C LibOS $@
 	$(MAKE) -C Runtime $@
-
-.PHONY: install
-install:
-	@echo "\"make install\" is deprecated. use \"make\" instead."

Pal/Makefile

@@ -19,8 +19,3 @@ format:
 	                               -path ./lib/crypto/udivmodti4.c -prune -o \
 	                               -path ./src/host/Linux-SGX/sgx-driver -prune -o \
 	                               \( -name '*.h' -o -name '*.c' \) -print)
-
-.PHONY: pack
-pack:
-	$(MAKE) -C test pack
-	$(MAKE) -C regression pack

Runtime/Makefile

@@ -7,6 +7,3 @@ clean:
 
 .PHONY: format
 format:
-
-.PHONY: pack
-pack: