[PATCH v3] build: update DPDK to use C11 standard

[Patrick Robb]

Hi Bruce,

I see some failures for this series for our Ubuntu 20.04 containers. And,
our DTS testbeds which are on ubuntu 20.04 are skipping running
testsuites because they can't compile DPDK. So, that's why it has some
missing results for a couple of the Intel NICs. For context, I'll paste
below where the compile job terminates in one of our containerized compile
test runs. The GCC in use here is version 9.4, so it meets the requirements
as described in your patch as far as I can tell. I'll check it out more
tomorrow to see whether it's an infra failure, like some missing
dependencies. Please let me know if we expect to have no issues with 20.04
or if this is anticipated.

Thanks!

[1638/2730] Generating symbol file 'drivers/a715181@@rte_net_ixgbe at sha
/librte_net_ixgbe.so.24.0.symbols'.
[1639/2730] Compiling C object 'drivers/a715181@@tmp_rte_net_mlx4 at sta
/net_mlx4_mlx4.c.o'.
FAILED: drivers/a715181@@tmp_rte_net_mlx4 at sta/net_mlx4_mlx4.c.o
ccache cc -Idrivers/a715181@@tmp_rte_net_mlx4 at sta -Idrivers -I../drivers
-Idrivers/net/mlx4 -I../drivers/net/mlx4 -Ilib/ethdev -I../lib/ethdev -I.
-I../ -Iconfig -I../config -Ilib/eal/include -I../lib/eal/include
-Ilib/eal/linux/include -I../lib/eal/linux/include -Ilib/eal/x86/include
-I../lib/eal/x86/include -Ilib/eal/common -I../lib/eal/common -Ilib/eal
-I../lib/eal -Ilib/kvargs -I../lib/kvargs -Ilib/telemetry/../metrics
-I../lib/telemetry/../metrics -Ilib/telemetry -I../lib/telemetry -Ilib/net
-I../lib/net -Ilib/mbuf -I../lib/mbuf -Ilib/mempool -I../lib/mempool
-Ilib/ring -I../lib/ring -Ilib/meter -I../lib/meter -Idrivers/bus/pci
-I../drivers/bus/pci -I../drivers/bus/pci/linux -Ilib/pci -I../lib/pci
-Idrivers/bus/vdev -I../drivers/bus/vdev -I/usr/include/libnl3
-fdiagnostics-color=always -pipe -D_FILE_OFFSET_BITS=64 -Wall -Winvalid-pch
-Wextra -Werror -std=c11 -O3 -include rte_config.h -Wcast-qual -Wdeprecated
-Wformat -Wformat-nonliteral -Wformat-security -Wmissing-declarations
-Wmissing-prototypes -Wnested-externs -Wold-style-definition
-Wpointer-arith -Wsign-compare -Wstrict-prototypes -Wundef -Wwrite-strings
-Wno-address-of-packed-member -Wno-packed-not-aligned
-Wno-missing-field-initializers -D_GNU_SOURCE -fPIC -march=native
-DALLOW_EXPERIMENTAL_API -DALLOW_INTERNAL_API -Wno-format-truncation
-std=c11 -Wno-strict-prototypes -D_BSD_SOURCE -D_DEFAULT_SOURCE
-D_XOPEN_SOURCE=600 -UPEDANTIC -DRTE_LOG_DEFAULT_LOGTYPE=pmd.net.mlx4 -MD
-MQ 'drivers/a715181@@tmp_rte_net_mlx4 at sta/net_mlx4_mlx4.c.o' -MF
'drivers/a715181@@tmp_rte_net_mlx4 at sta/net_mlx4_mlx4.c.o.d' -o
'drivers/a715181@@tmp_rte_net_mlx4 at sta/net_mlx4_mlx4.c.o' -c
../drivers/net/mlx4/mlx4.c
In file included from ../drivers/net/mlx4/mlx4_rxtx.h:27,
                 from ../drivers/net/mlx4/mlx4.c:49:
../drivers/net/mlx4/mlx4_prm.h:111:8: error: redefinition of 'struct
mlx4_wqe_lso_seg'
  111 | struct mlx4_wqe_lso_seg {
      |        ^~~~~~~~~~~~~~~~
In file included from ../drivers/net/mlx4/mlx4_glue.h:16,
                 from ../drivers/net/mlx4/mlx4.c:46:
/usr/include/infiniband/mlx4dv.h:410:8: note: originally defined here
  410 | struct mlx4_wqe_lso_seg {
      |        ^~~~~~~~~~~~~~~~
ninja: build stopped: subcommand failed.
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