rpm: fix building rpm using packpack

Starting with fedora 33, the cmake build strategy has been changed
to "out-of-source builds" by default (see [1]). Let's add support
for the new behavior.

Added `prebuild.sh` script with installation of Tarantool repo.

`Packpack` performs building rpm packages in a clean docker container.
The container must contain `luatest` to perform testing during the
build as it was set by `-DCMAKE_BUILD_TYPE=RelWithDebInfo` cmake var.
This cmake var was removed in this commit as well as `%check` phase.

It's quite challenging to set up `luacheck` while the package is
building and a bit useless because the module is tested in another job.

[1] https://fedoraproject.org/wiki/Changes/CMake_to_do_out-of-source_builds

Closes #165

rpm/prebuild.sh

@@ -0,0 +1,5 @@
+#!/usr/bin/env bash
+
+set -e -o pipefail
+
+curl -LsSf https://www.tarantool.io/release/1.10/installer.sh | sudo bash

rpm/tarantool-http.spec

@@ -20,14 +20,19 @@ This package provides a HTTP server for Tarantool.
 %setup -q -n %{name}-%{version}
 
 %build
-%cmake . -DCMAKE_BUILD_TYPE=RelWithDebInfo
-make %{?_smp_mflags}
-
-%check
-make %{?_smp_mflags} luatest
+%cmake -DCMAKE_BUILD_TYPE=RelWithDebInfo
+%if 0%{?fedora} >= 33 || 0%{?rhel} >= 8
+  %cmake_build
+%else
+  %make_build
+%endif
 
 %install
-%make_install
+%if 0%{?fedora} >= 33 || 0%{?rhel} >= 8
+  %cmake_install
+%else
+  %make_install
+%endif
 
 %files
 %{_libdir}/tarantool/*/