Exclude doc package from flatpak build

The problem is that the BuildRequires ghostscript.spec in turn has a

  Requires:         %{_bindir}/dvips

which would expand to non-existent /app/bin/dvips when libtommath is built as a
flatpak (as a dependency of building libreoffice as a flatpak), which would
break the build.  The easiest fix appears to be to just not build docs for the
flatpak case.

libtommath.spec

@@ -7,9 +7,11 @@ URL:            http://www.libtom.net/
 
 Source0:        https://github.com/libtom/%{name}/archive/v%{version}.tar.gz#/%{name}-%{version}.tar.gz
 
+BuildRequires:  libtool
+
+%if ! 0%{?flatpak}
 BuildRequires:  ghostscript
 BuildRequires:  libtiff-tools
-BuildRequires:  libtool
 BuildRequires:  texlive-dvips-bin
 BuildRequires:  ghostscript-tools-dvipdf
 BuildRequires:  texlive-latex-bin-bin
@@ -19,6 +21,7 @@ BuildRequires:  texlive-updmap-map
 BuildRequires:  tex(cmr10.tfm)
 BuildRequires:  tex(fancyhdr.sty)
 BuildRequires:  tex(hyphen.tex)
+%endif
 
 %description
 A free open source portable number theoretic multiple-precision integer library
@@ -34,6 +37,7 @@ Requires:       %{name}%{?_isa} = %{version}-%{release}
 The %{name}-devel package contains libraries and header files for developing
 applications that use %{name}.
 
+%if ! 0%{?flatpak}
 %package        doc
 Summary:        Documentation files for %{name}
 BuildArch:      noarch
@@ -42,6 +46,7 @@ Obsoletes:      %{name}-doc < 0.42-1
 
 %description    doc
 The %{name}-doc package contains PDF documentation for using %{name}.
+%endif
 
 %prep
 %setup -q
@@ -56,7 +61,9 @@ sed -i \
 %build
 %set_build_flags
 %make_build V=1 CFLAGS="$CFLAGS -I./" -f makefile.shared
+%if ! 0%{?flatpak}
 make V=1 -f makefile poster manual docs
+%endif
 
 %install
 %make_install V=1 CFLAGS="$CFLAGS -I./" PREFIX=%{_prefix} LIBPATH=%{_libdir} -f makefile.shared
@@ -75,8 +82,10 @@ find %{buildroot} -name '*.a' -delete
 %{_libdir}/*.so
 %{_libdir}/pkgconfig/*.pc
 
+%if ! 0%{?flatpak}
 %files doc
 %doc doc/bn.pdf doc/poster.pdf doc/tommath.pdf
+%endif
 
 %changelog
 * Wed Jan 29 2020 Fedora Release Engineering <releng@fedoraproject.org> - 1.1.0-2