Description: mk: sort headers before wildcard inclusion

In order to achieve fully reproducible builds, always use the same
inclusion order for headers in the Makefiles.

Origin: http://dpdk.org/dev/patchwork/patch/27509/
Forwarded: yes
Author: Luca Boccassi <luca.boccassi@gmail.com>
Last-Update: 2017-08-10
---
 examples/ip_pipeline/Makefile                              | 2 +-
 examples/multi_process/client_server_mp/mp_server/Makefile | 2 +-
 examples/server_node_efd/server/Makefile                   | 2 +-
 lib/librte_eal/common/Makefile                             | 2 +-
 4 files changed, 4 insertions(+), 4 deletions(-)

--- a/examples/ip_pipeline/Makefile
+++ b/examples/ip_pipeline/Makefile
@@ -45,7 +45,7 @@ APP = ip_pipeline
 
 VPATH += $(SRCDIR)/pipeline
 
-INC += $(wildcard *.h) $(wildcard pipeline/*.h)
+INC += $(sort $(wildcard *.h)) $(sort $(wildcard pipeline/*.h))
 
 # all source are stored in SRCS-y
 SRCS-$(CONFIG_RTE_LIBRTE_PIPELINE) := main.c
--- a/examples/multi_process/client_server_mp/mp_server/Makefile
+++ b/examples/multi_process/client_server_mp/mp_server/Makefile
@@ -49,7 +49,7 @@ APP = mp_server
 # all source are stored in SRCS-y
 SRCS-y := main.c init.c args.c
 
-INC := $(wildcard *.h)
+INC := $(sort $(wildcard *.h))
 
 CFLAGS += $(WERROR_FLAGS) -O3
 CFLAGS += -I$(SRCDIR)/../shared
--- a/lib/librte_eal/common/Makefile
+++ b/lib/librte_eal/common/Makefile
@@ -50,7 +50,7 @@ GENERIC_INC := rte_atomic.h rte_byteorde
 GENERIC_INC += rte_spinlock.h rte_memcpy.h rte_cpuflags.h rte_rwlock.h
 # defined in mk/arch/$(RTE_ARCH)/rte.vars.mk
 ARCH_DIR ?= $(RTE_ARCH)
-ARCH_INC := $(notdir $(wildcard $(RTE_SDK)/lib/librte_eal/common/include/arch/$(ARCH_DIR)/*.h))
+ARCH_INC := $(sort $(notdir $(wildcard $(RTE_SDK)/lib/librte_eal/common/include/arch/$(ARCH_DIR)/*.h)))
 
 SYMLINK-$(CONFIG_RTE_LIBRTE_EAL)-include := $(addprefix include/,$(INC))
 SYMLINK-$(CONFIG_RTE_LIBRTE_EAL)-include += \