[LibOS,Pal] remove unnecessary `.PHONY: default` in Makefiles

LibOS/shim/test/Makefile

@@ -3,9 +3,6 @@ include ../../../Scripts/Makefile.configs
 # SUBDIRS = regression native inline benchmark
 SUBDIRS = native fs
 
-.PHONY: default
-default: all
-
 .PHONY: all clean sgx-tokens distclean
 all clean sgx-tokens distclean:
 	for d in $(SUBDIRS); do \

LibOS/shim/test/inline/Makefile

@@ -4,9 +4,6 @@ cxx_executables = $(patsubst %.cpp,%,$(wildcard *.cpp))
 exec_target = $(c_executables) $(cxx_executables)
 target = $(c_executables) $(cxx_executables) manifest
 
-.PHONY: default
-default: all
-
 include ../../../../Scripts/Makefile.configs
 include ../../../../Scripts/Makefile.manifest
 include ../../../../Scripts/Makefile.Test

LibOS/shim/test/regression/Makefile

@@ -7,9 +7,6 @@ target = $(exec_target) $(manifests)
 
 clean-extra += clean-tmp
 
-.PHONY: default
-default: all
-
 include ../../../../Scripts/Makefile.configs
 include ../../../../Scripts/Makefile.manifest
 include ../../../../Scripts/Makefile.Test

Pal/regression/Makefile

@@ -45,9 +45,6 @@ include ../../Scripts/Makefile.manifest
 graphene_lib = .lib/graphene-lib.a
 pal_lib = ../../Runtime/libpal-$(PAL_HOST).so
 
-.PHONY: default
-default: all
-
 RUNTIME_DIR = $(CURDIR)/../../Runtime
 
 .PHONY: all

Pal/test/Makefile

@@ -4,9 +4,6 @@ include ../../Scripts/Makefile.rules
 CFLAGS += -fno-builtin -nostdlib -no-pie \
 	  -I../include/pal -I../lib
 
-.PHONY: default
-default: all
-
 executables = HelloWorld File Failure Thread Fork Event Process Exception \
 	      Memory Pipe Tcp Udp Yield Server Wait HandleSend Select Segment \
 	      Sleep Cpuid Pie

Scripts/Makefile.Test

@@ -20,9 +20,6 @@ CFLAGS-libos-debug = -I$(SHIMDIR)/include -I$(PALDIR)/../include/pal -I$(PALDIR)
 CXXFLAGS-libos-debug = -I$(SHIMDIR)/include -I$(PALDIR)/../include/pal -I$(PALDIR)/../lib -fno-builtin -nostdlib
 LDFLAGS-libos-debug = -L$(SHIMDIR)/src -L$(PALDIR)/host/$(PAL_HOST) -Wl,-rpath-link=$(abspath $(RUNTIME)) -lpal -lsysdb_debug
 
-.PHONY: default
-default: all
-
 .PHONY: all
 all: pal_loader $(target) | $(exec_target) $(call expand_target_to_sgx,$(exec_target)) $(call expand_target_to_sig,$(exec_target))