make the run-time dependency on libssh2 optional

libgit2.spec

@@ -1,6 +1,13 @@
+# libssh2 is not available on RHEL
+%if 0%{?rhel}
+%bcond_with libssh2
+%else
+%bcond_without libssh2
+%endif
+
 Name:           libgit2
 Version:        1.1.0
-Release:        3%{?dist}
+Release:        4%{?dist}
 Summary:        C implementation of the Git core methods as a library with a solid API
 License:        GPLv2 with exceptions
 URL:            https://libgit2.org/
@@ -11,7 +18,9 @@ BuildRequires:  cmake >= 3.5.1
 BuildRequires:  ninja-build
 BuildRequires:  http-parser-devel
 BuildRequires:  libcurl-devel
+%if %{with libssh2}
 BuildRequires:  libssh2-devel
+%endif
 BuildRequires:  openssl-devel
 BuildRequires:  pcre2-devel
 BuildRequires:  python3
@@ -53,6 +62,9 @@ rm -vr deps
   -DUSE_SHA1=HTTPS \
   -DUSE_HTTPS=OpenSSL \
   -DUSE_NTLMCLIENT=OFF \
+%if %{without libssh2}
+  -DUSE_SSH=OFF \
+%endif
   %{nil}
 %ninja_build -C %{_target_platform}
 
@@ -74,6 +86,9 @@ rm -vr deps
 %{_includedir}/git2/
 
 %changelog
+* Thu Mar 18 2021 Kamil Dudka <kdudka@redhat.com> - 1.1.0-4
+- make the run-time dependency on libssh2 optional
+
 * Tue Jan 26 2021 Fedora Release Engineering <releng@fedoraproject.org> - 1.1.0-3
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_34_Mass_Rebuild