native: remove non required NATIVEINCLUDES

Some modules used a 'NATIVEINCLUDES' with different include path and no other
included directories.
It was defining basic 'include' in a different order and not using other things
defined in INCLUDES.
After doing some checks with the given include path and possible conflicting
files, there should be no conflict when using the default one.

* No common headers between all the NATIVEINCLUDES directories
* No common headers files between board/native/include, cpu/native/include and
  other files in the repository (except other boards/cpus of course).

boards/native/Makefile

@@ -3,5 +3,3 @@ MODULE = board
 DIRS = drivers
 
 include $(RIOTBASE)/Makefile.base
-
-INCLUDES = $(NATIVEINCLUDES)

boards/native/Makefile.include

@@ -1,10 +1,8 @@
-export NATIVEINCLUDES += -DNATIVE_INCLUDES
-export NATIVEINCLUDES += -I$(RIOTBOARD)/$(BOARD)/include/
-export NATIVEINCLUDES += -I$(RIOTBASE)/core/include/
-export NATIVEINCLUDES += -I$(RIOTBASE)/drivers/include/
-
 export CPU = native
 
+# Configuration for core/include/kernel_types.h
+CFLAGS += -DNATIVE_INCLUDES
+
 USEMODULE += native-drivers
 
 # toolchain:
@@ -117,7 +115,7 @@ debug-valgrind-server: export VALGRIND_FLAGS ?= --vgdb=yes --vgdb-error=0 -v \
 term-cachegrind: export CACHEGRIND_FLAGS += --tool=cachegrind
 term-gprof: export TERMPROG = GMON_OUT_PREFIX=gmon.out $(ELFFILE)
 all-valgrind: export CFLAGS += -DHAVE_VALGRIND_H -g
-all-valgrind: export NATIVEINCLUDES += $(shell pkg-config valgrind --cflags)
+all-valgrind: export CFLAGS += $(shell pkg-config valgrind --cflags)
 all-debug: export CFLAGS += -g
 all-cachegrind: export CFLAGS += -g
 all-gprof: export CFLAGS += -pg
@@ -126,8 +124,6 @@ all-asan: export CFLAGS += -fsanitize=address -fno-omit-frame-pointer -g
 all-asan: export CFLAGS += -DNATIVE_IN_CALLOC
 all-asan: export LINKFLAGS += -fsanitize=address -fno-omit-frame-pointer -g
 
-export INCLUDES += $(NATIVEINCLUDES)
-
 export CFLAGS += -DDEBUG_ASSERT_VERBOSE
 
 # workaround for https://gcc.gnu.org/bugzilla/show_bug.cgi?id=52624

boards/native/drivers/Makefile

@@ -1,5 +1,3 @@
 MODULE = native-drivers
 
 include $(RIOTBASE)/Makefile.base
-
-INCLUDES = $(NATIVEINCLUDES)

cpu/native/Makefile

@@ -24,5 +24,3 @@ ifneq (,$(filter can_linux,$(USEMODULE)))
 endif
 
 include $(RIOTBASE)/Makefile.base
-
-INCLUDES = $(NATIVEINCLUDES)

cpu/native/Makefile.include

@@ -1,8 +1,6 @@
-export NATIVEINCLUDES += -I$(RIOTCPU)/native/include -I$(RIOTBASE)/sys/include
-
 # Local include for OSX
 ifeq ($(BUILDOSXNATIVE),1)
-    export NATIVEINCLUDES += -I$(RIOTCPU)/native/osx-libc-extra
+    INCLUDES += -I$(RIOTCPU)/native/osx-libc-extra
 endif
 
 USEMODULE += periph

cpu/native/mtd/Makefile

@@ -1,5 +1,3 @@
 MODULE := mtd_native
 
 include $(RIOTBASE)/Makefile.base
-
-INCLUDES = $(NATIVEINCLUDES)

cpu/native/netdev_tap/Makefile

@@ -1,3 +1 @@
 include $(RIOTBASE)/Makefile.base
-
-INCLUDES = $(NATIVEINCLUDES)

cpu/native/socket_zep/Makefile

@@ -1,3 +1 @@
 include $(RIOTBASE)/Makefile.base
-
-INCLUDES = $(NATIVEINCLUDES)