Increase tests timeout for riscv64

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

gimp.spec

@@ -64,7 +64,7 @@ Summary:        GNU Image Manipulation Program
 Name:           gimp
 Epoch:          2
 Version:        2.99.19^20240916gitca9d57a417
-Release:        %autorelease
+Release:        %autorelease -e 0.riscv64
 
 # Compute some version related macros.
 
@@ -475,7 +475,11 @@ for suite in $suites; do
         done | sort -u
     )"
     if [ -n "$suite_tests" ]; then
+        %ifnarch riscv64
         %meson_test --suite "$suite" $suite_tests
+        %else
+        %meson_test --timeout-multiplier 10 --suite "$suite" $suite_tests
+        %endif
     fi
 done
 %endif