Fix standard Fedora linker flags missing

- Resolves #1548709

Signed-off-by: Rafael Santos <rdossant@redhat.com>

libtomcrypt.spec

@@ -1,6 +1,6 @@
 Name:           libtomcrypt
 Version:        1.18.1
-Release:        3%{?dist}
+Release:        4%{?dist}
 Summary:        A comprehensive, portable cryptographic toolkit
 License:        Public Domain or WTFPL
 URL:            http://www.libtom.net/
@@ -50,12 +50,12 @@ The %{name}-doc package contains documentation for use with %{name}.
 %setup -q
 
 %build
+%set_build_flags
 export PREFIX="%{_prefix}"
 export INCPATH="%{_includedir}"
 export LIBPATH="%{_libdir}"
-export LDFLAGS="%{?__global_ldflags}"
 export EXTRALIBS="-ltommath"
-export CFLAGS="%{optflags} -DLTM_DESC -DUSE_LTM"
+export CFLAGS="%{build_cflags} -DLTM_DESC -DUSE_LTM"
 %make_build V=1 -f makefile.shared library
 %make_build V=1 -f makefile docs
 %make_build V=1 -f makefile.shared test
@@ -91,6 +91,9 @@ sed -i \
 %doc doc/crypt.pdf
 
 %changelog
+* Mon Apr 09 2018 Rafael Santos <rdossant@redhat.com> - 1.18.1-4
+- Fix missing Fedora linker flags (bug #1548709)
+
 * Wed Feb 07 2018 Fedora Release Engineering <releng@fedoraproject.org> - 1.18.1-3
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_28_Mass_Rebuild