Disable ffcall on RISC-V (riscv64)

There is no port for ffcall at this point.

Signed-off-by: David Abdurachmanov <david.abdurachmanov@sifive.com>

clisp.spec

@@ -7,7 +7,7 @@
 Name:		clisp
 Summary:	ANSI Common Lisp implementation
 Version:	2.49.93
-Release:	8.%{shortcommit}git%{?dist}
+Release:	8.%{shortcommit}git.0.riscv64%{?dist}
 License:	GPLv2+
 URL:		http://www.clisp.org/
 # The source for this package was pulled from upstream's git repository.
@@ -28,7 +28,9 @@ Patch4:		%{name}-register-volatile.patch
 BuildRequires:	dbus-devel
 BuildRequires:	emacs
 BuildRequires:	fcgi-devel
+%ifnarch riscv64
 BuildRequires:	ffcall-devel
+%endif
 BuildRequires:	gcc
 BuildRequires:	gdbm-devel
 BuildRequires:	gettext-devel
@@ -161,7 +163,9 @@ export LC_ALL=C.UTF-8
 	    --with-module=rawsock \
 	    --with-module=zlib \
 	    --with-libreadline-prefix=$PWD/readline \
+%ifnarch riscv64
 	    --with-ffcall \
+%endif
 	    --cbcx \
 	    build \
 	    CPPFLAGS="-I/usr/include/libsvm" \
@@ -404,6 +408,9 @@ ln -s ../../src/modules.c build/full/modules.c
 
 
 %changelog
+* Sun Aug 18 2019 David Abdurachmanov <david.abdurachmanov@sifive.com> - 2.49.93-8.df3b9f6git.0.riscv64
+- Disable ffcall on RISC-V (riscv64)
+
 * Wed Jul 24 2019 Fedora Release Engineering <releng@fedoraproject.org> - 2.49.93-8.df3b9f6git
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_31_Mass_Rebuild