[Rpm-maint] [rpm-software-management/rpm] Multi-line update-alternatives calls in scriptlets failing with 6.0 beta 1 (Issue #3865)

[Zbigniew Jędrzejewski-Szmek]

keszybz left a comment (rpm-software-management/rpm#3865)

execsnoop says:
`alternatives     1387515 1387511   0 /usr/sbin/alternatives --install /usr/bin/fakeroot fakeroot /usr/bin/fakeroot-tcp 50 --slave /usr/bin/faked faked /usr/bin/faked-tcp --slave /usr/lib64/libfakeroot/libfakeroot-0.so libfakeroot.so /usr/lib64/libfakeroot/libfakeroot-tcp.so`
`alternatives     1387516 1387511   0 /usr/sbin/alternatives --install /usr/bin/fakeroot fakeroot /usr/bin/fakeroot-sysv 40 --slave /usr/bin/faked faked /usr/bin/faked-sysv --slave /usr/lib64/libfakeroot/libfakeroot-0.so libfakeroot.so /usr/lib64/libfakeroot/libfakeroot-sysv.so \`

The source in the spec file looks like this
```rpm
/usr/sbin/alternatives --install "%{_bindir}/fakeroot" fakeroot \
  "%{_bindir}/fakeroot-tcp" 50 \
  --slave %{_bindir}/faked faked %{_bindir}/faked-tcp \
  --slave %{_libdir}/libfakeroot/libfakeroot-0.so libfakeroot.so %{_libdir}/libfakeroot/libfakeroot-tcp.so \

/usr/sbin/alternatives --install "%{_bindir}/fakeroot" fakeroot \
  "%{_bindir}/fakeroot-sysv" 40 \
  --slave %{_bindir}/faked faked %{_bindir}/faked-sysv \
  --slave %{_libdir}/libfakeroot/libfakeroot-0.so libfakeroot.so %{_libdir}/libfakeroot/libfakeroot-sysv.so \

```

My guess is that the whitespace is trimmed from the section and then the last continuation symbol is not handled properly.

Tested with `rpm-5.99.91-1.fc43.x86_64`.

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