Build with -ffp-contract=off on riscv64

Otherwise we have a single failing tests because on NaN.

Signed-off-by: David Abdurachmanov <davidlt@rivosinc.com>

gawk.spec

@@ -47,7 +47,7 @@
 Name:             gawk
 Summary:          The GNU version of the AWK text processing utility
 Version:          5.1.1
-Release:          5%{?dist}
+Release:          5.0.riscv64%{?dist}
 
 License:          GPLv3+ and GPLv2+ and LGPLv2+ and BSD
 
@@ -205,6 +205,10 @@ git commit --all --amend --no-edit > /dev/null
 # ---------------
 
 %build
+%ifarch riscv64
+%define _pkg_extra_cflags -ffp-contract=off
+%endif
+
 # NOTE: The re-generating of ./configure (below) should be removed once the
 #       direct dependency on 'aclocal-1.15' is fixed in upstream and backported.
 autoreconf --force --verbose
@@ -292,6 +296,9 @@ install -m 0644 -p awklib/eg/data/* %{buildroot}%{_docdir}/%{name}/eg/data/
 # =============================================================================
 
 %changelog
+* Wed Mar 01 2023 David Abdurachmanov <davidlt@rivosinc.com> - 5.1.1-5.0.riscv64
+- Build with -ffp-contract=off on riscv64
+
 * Thu Jan 19 2023 Fedora Release Engineering <releng@fedoraproject.org> - 5.1.1-5
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_38_Mass_Rebuild