spec: Pass -pie separately to RPM_LD_FLAGS

Clang does not support setting it from the -specs file

ttmkfdir.spec

@@ -1,7 +1,7 @@
 Summary: Utility to create fonts.scale files for truetype fonts
 Name: ttmkfdir
 Version: 3.0.9
-Release: 59%{?dist}
+Release: 60%{?dist}
 # Only licensing attribution is in README, no version.
 License: LGPLv2+
 # This is a Red Hat maintained package which is specific to
@@ -37,7 +37,7 @@ by the font server.
 %autosetup -p1
 
 %build
-%{make_build} OPTFLAGS="$RPM_OPT_FLAGS"
+%{make_build} OPTFLAGS="$RPM_OPT_FLAGS" RPM_LD_FLAGS="$RPM_LD_FLAGS -pie"
 
 %install
 %{make_install} PREFIX="%{_prefix}"
@@ -50,6 +50,9 @@ cp -p %{SOURCE10} %{buildroot}%{_mandir}/man1/
 %{_mandir}/man1/ttmkfdir.1*
 
 %changelog
+* Mon Mar 30 2020 Timm Baeder <tbaeder@redhat.com> - 3.0.9-60
+- Pass -pie separately to %%{make_build}
+
 * Mon Mar 16 2020 Tom Stellard <tstellar@redhat.com> - 3.0.9-59
 - Use make_build and make_install macros
 - https://docs.fedoraproject.org/en-US/packaging-guidelines/#_parallel_make