syscalls/mmap15: Rewrite test using new LTP API #53

Job	Run time
job (debian:stable, gcc, i386)	9m 51s
job (debian:stable, ppc64el, powerpc64le-linux-gnu-gcc, 1, out, cross-compile)	6m 34s
job (debian:stable, arm64, aarch64-linux-gnu-gcc, 1, out, cross-compile)	6m 33s
job (debian:stable, s390x, s390x-linux-gnu-gcc, 1, out, cross-compile)	6m 10s
job (alpine:latest, gcc, asciidoctor)	5m 11s
job (debian:stable, gcc, out, minimal)	6m 59s
job (fedora:latest, clang, 1, asciidoctor-pdf)	8m 19s
job (centos:7, gcc, asciidoc-pdf, out)	5m 13s
job (debian:testing, gcc, asciidoctor-pdf)	11m 11s
job (debian:oldstable, clang)	10m 35s
job (opensuse/leap, gcc, asciidoc-pdf)	8m 55s
job (debian:oldstable, gcc, asciidoctor)	8m 22s
job (debian:testing, clang, asciidoctor-pdf)	11m 34s
job (ubuntu:jammy, gcc, asciidoctor, out)	6m 0s
job (ubuntu:bionic, gcc, asciidoc-pdf)	6m 38s
	1h 58m 5s

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