[dpdk-ci] DPDK compilation changes

[Thomas Monjalon]

Some changes were applied today in DPDK
regarding make and meson builds.

For "make" build, a pause is added,
and should be skipped by adding this line in the CI scripts:
	export MAKE_PAUSE=n

You can also add this line in a file .develconfig loaded
by devtools/load-devel-config in devtools/test-build.sh

For "meson" build on x86 Linux with devtools/test-meson-builds.sh,
2 cross-compilations are added:

	- Windows with MinGW-w64
	http://mingw-w64.org/doku.php/download/mingw-builds

	- PPC64 Linux
	https://toolchains.bootlin.com/releases_powerpc64le-power8.html