[PAL/Linux] Clean up -Wsign-compare flags

Pal/src/host/Linux/Makefile

@@ -24,7 +24,7 @@ all: $(host_files)
 
 ifeq ($(DEBUG),1)
 CC += -gdwarf-2 -g3
-CFLAGS += -DDEBUG -Wsign-compare
+CFLAGS += -DDEBUG
 export DEBUG
 endif
 

Pal/src/host/Linux/Makefile.am

@@ -5,7 +5,7 @@ SEC_DIR = security/$(PAL_HOST)
 CFLAGS	= -Wall -fPIC -O2 -std=c11 -U_FORTIFY_SOURCE \
 	  -fno-stack-protector -fno-builtin
 
-EXTRAFLAGS = -Wextra -Wno-sign-compare $(call cc-option,-Wnull-dereference)
+EXTRAFLAGS = -Wextra $(call cc-option,-Wnull-dereference)
 
 CFLAGS += $(EXTRAFLAGS)