Disable intrinsics on riscv64

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

libunicode.spec

@@ -1,13 +1,13 @@
 Name:           libunicode
 Version:        0.4.0
-Release:        %autorelease
+Release:        %autorelease -e 0.riscv64
 Summary:        Modern C++20 Unicode Library
 License:        Apache-2.0
 URL:            https://github.com/contour-terminal/libunicode
 Source0:        %{url}/archive/v%{version}/%{name}-%{version}.tar.gz
 Patch0:         libunicode-fix-catch-in-cmake.patch
 
-ExclusiveArch:  x86_64 aarch64
+ExclusiveArch:  x86_64 aarch64 riscv64
 
 BuildRequires:  gcc-c++
 BuildRequires:  cmake
@@ -43,6 +43,9 @@ The %{name}-tools package contains tools about %{name}.
 %cmake \
     -GNinja \
     -DCMAKE_BUILD_TYPE=Release \
+    %ifarch riscv64
+    -DLIBUNICODE_USE_INTRINSICS=OFF \
+    %endif
     -DLIBUNICODE_UCD_DIR=%{_datadir}/unicode/ucd \
 
 %cmake_build