Optionally enable additional wal-g features

`wal-g` can be built with additonal features that require linking witih
system libraries.  Using build conditions, we can enable these as
needed.  LZO is enabled by default for compatibility with WAL-E backups
created by the Postgres Operator/Spilo.

wal-g.spec

@@ -7,9 +7,13 @@
 %bcond mysql 0
 %bcond sqlserver 0
 
+%bcond lzo 1
+%bcond brotli 0
+%bcond libsodium 0
+
 Name:		wal-g
 Version:	3.0.1
-Release:        1%{?dist}
+Release:        2%{?dist}
 Summary:	Archival and Restoration for databases in the Cloud
 
 License:	Apache-2.0
@@ -18,6 +22,15 @@ Source:		%{name}-%{version}.tar.gz
 
 BuildRequires:	golang
 BuildRequires:	git-core
+%if %{with lzo}
+BuildRequires:	lzo-devel
+%endif
+%if %{with brotli}
+BuildRequires:	brotli-devel
+%endif
+%if %{with libsodium}
+BuildRequires:	libsodium-devel
+%endif
 
 %description
 WAL-G is an archival restoration tool for PostgreSQL, MySQL/MariaDB, and MS SQL
@@ -71,6 +84,16 @@ Requires:	%{name} = %{version}
 
 
 %build
+%if %{with lzo}
+export USE_LZO=1
+%endif
+%if %{with brotli}
+export USE_BROTLI=1
+%endif
+%if %{with libsodium}
+export USE_LIBSODIUM=1
+%endif
+
 %if %{with postgresql}
 make pg_build
 %endif