static link + pkg-config assistance

[Ben Magistro <koncept1@gmail.com>]

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I've been working through some updates to the build system for TLDK and
have been working through the different variants (system vs fallback +
shared vs static).  I've been able to successfully build and run the unit
test app for most of these combinations however, I haven't been able to get
the system static combination to work successfully yet,

OS: CentOS 7.9 + devtoolset-9 (gcc 9.3.1)
DPDK: 21.11

I built DPDK using `meson build` + `ninja -C build` using default options
and installed using `ninja -C build install`.

When configuring TLDK, I get an error indicating the static libraries
cannot be found.  I'm still investigating this, but could use some
assistance.  I wouldn't rule out an issue in the meson files for TLDK.

[bmagistro@lvdi-01 tldk-system-static]$ meson build
-Dpkg_config_path=/usr/local/lib64/pkgconfig
The Meson build system
Version: 0.55.1
Source dir: /home/bmagistro/github/tldk-system-static
Build dir: /home/bmagistro/github/tldk-system-static/build
Build type: native build
Program cat found: YES
Project name: TLDK
Project version: 21.11.0
C compiler for the host machine: cc (gcc 9.3.1 "cc (GCC) 9.3.1 20200408
(Red Hat 9.3.1-2)")
C linker for the host machine: cc ld.bfd 2.32-16
C++ compiler for the host machine: c++ (gcc 9.3.1 "c++ (GCC) 9.3.1 20200408
(Red Hat 9.3.1-2)")
C++ linker for the host machine: c++ ld.bfd 2.32-16
Host machine cpu family: x86_64
Host machine cpu: x86_64
Message: ## Building in Developer Mode ##
Found pkg-config: /usr/bin/pkg-config (0.27.1)
WARNING: Static library ':librte_common_cpt.a' not found for dependency
'libdpdk', may not be statically linked
WARNING: Static library ':librte_common_dpaax.a' not found for dependency
'libdpdk', may not be statically linked
WARNING: Static library ':librte_common_iavf.a' not found for dependency
'libdpdk', may not be statically linked
WARNING: Static library ':librte_common_octeontx.a' not found for
dependency 'libdpdk', may not be statically linked
WARNING: Static library ':librte_common_octeontx2.a' not found for
dependency 'libdpdk', may not be statically linked
WARNING: Static library ':librte_bus_auxiliary.a' not found for dependency
'libdpdk', may not be statically linked
WARNING: Static library ':librte_bus_dpaa.a' not found for dependency
'libdpdk', may not be statically linked
WARNING: Static library ':librte_bus_fslmc.a' not found for dependency
'libdpdk', may not be statically linked
....
WARNING: Static library ':librte_telemetry.a' not found for dependency
'libdpdk', may not be statically linked
WARNING: Static library ':librte_kvargs.a' not found for dependency
'libdpdk', may not be statically linked
WARNING: Static library 'elf' not found for dependency 'libdpdk', may not
be statically linked
WARNING: Static library 'pcap' not found for dependency 'libdpdk', may not
be statically linked
WARNING: Static library 'z' not found for dependency 'libdpdk', may not be
statically linked
Run-time dependency libdpdk found: YES 21.11.0
Run-time dependency GTest found: NO (tried pkgconfig and system)
Looking for a fallback subproject for the dependency gtest

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