[Bug 955] build failure in qos_sched example app

[bugzilla at dpdk.org]

https://bugs.dpdk.org/show_bug.cgi?id=955

            Bug ID: 955
           Summary: build failure in qos_sched example app
           Product: DPDK
           Version: 20.11
          Hardware: All
                OS: All
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: examples
          Assignee: dev at dpdk.org
          Reporter: alialnu at nvidia.com
  Target Milestone: ---

"""
$ meson --werror -Dexamples=all build && ninja -C build
[..]
examples/qos_sched/args.c: In function 'app_parse_args':
examples/qos_sched/args.c:413:28: error: implicit declaration of function
'RTE_BIT64'; did you mean 'RTE_BE64'? [-Werror=implicit-function-declaration]
  413 |   if (app_used_core_mask & RTE_BIT64(app_main_core)) {
      |                            ^~~~~~~~~
      |                            RTE_BE64
examples/qos_sched/args.c:413:28: error: nested extern declaration of
'RTE_BIT64' [-Werror=nested-externs]
cc1: all warnings being treated as errors
"""

Also reproduces with clang:
"""
$ meson --werror --buildtype=debugoptimized -Dexamples=all build && ninja -C
build
[..]
examples/qos_sched/args.c:413:28: error: implicit declaration of function
'RTE_BIT64' is invalid in C99 [-Werror,-Wimplicit-function-declaration]
                if (app_used_core_mask & RTE_BIT64(app_main_core)) {
                                         ^
examples/qos_sched/args.c:419:24: error: implicit declaration of function
'RTE_BIT64' is invalid in C99 [-Werror,-Wimplicit-function-declaration]
        app_used_core_mask |= RTE_BIT64(app_main_core);
                              ^
2 errors generated.
"""

OS: Ubuntu 20.04.4
gcc: 9.3.0
clang: 10.0.0

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