Add static library subpackage

Some zstd APIs are only available via the static package. Make it
available so they can be used. These APIs are experimental, so
they should be used with care, but Fedora should still make them
available.

See https://facebook.github.io/zstd/zstd_manual.html#Chapter14
for more details.

zstd.spec

@@ -9,7 +9,7 @@
 
 Name:           zstd
 Version:        1.4.4
-Release:        1%{?dist}
+Release:        2%{?dist}
 Summary:        Zstd compression library
 
 License:        BSD and GPLv2
@@ -34,9 +34,15 @@ Zstandard compression shared library.
 Summary:        Header files for Zstd library
 Requires:       lib%{name}%{?_isa} = %{version}-%{release}
 
+%package -n lib%{name}-static
+Summary:        Static variant of the Zstd library
+Requires:       lib%{name}-devel = %{version}-%{release}
+
 %description -n lib%{name}-devel
 Header files for Zstd library.
 
+%description -n lib%{name}-static
+Static variant of the Zstd library.
 
 %prep
 %setup -q
@@ -65,8 +71,6 @@ CFLAGS="%{optflags}" CXXFLAGS="%{optflags} -std=c++11" make -C contrib/pzstd tes
 
 %install
 %make_install PREFIX=%{_prefix} LIBDIR=%{_libdir}
-# Don't install the static lib
-rm %{buildroot}/%{_libdir}/libzstd.a
 %if 0%{?with_pzstd}
 install -D -m755 contrib/pzstd/pzstd %{buildroot}/usr/bin/pzstd
 install -D -m644 programs/%{name}.1 %{buildroot}/%{_mandir}/man1/p%{name}.1
@@ -106,7 +110,13 @@ install -D -m644 programs/%{name}.1 %{buildroot}/%{_mandir}/man1/p%{name}.1
 %post -n lib%{name} -p /sbin/ldconfig
 %postun -n lib%{name} -p /sbin/ldconfig
 
+%files -n lib%{name}-static
+%{_libdir}/libzstd.a
+
 %changelog
+* Fri May 22 2020 Avi Kivity <avi@scylladb.com> - 1.4.4-3
+- Added static library subpackage
+
 * Wed Jan 15 2020 Pádraig Brady <P@draigBrady.com> - 1.4.4-1
 - Latest upstream