Disable JIT on riscv64 for now

Disable until this error is fixed:
/builddir/build/BUILD/webkitgtk-2.40.0/Source/JavaScriptCore/b3/B3Validate.cpp:455:43: error: 'toB3Type' was not declared in this scope

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

webkitgtk.spec

@@ -17,7 +17,7 @@
 
 Name:           webkitgtk
 Version:        2.40.0
-Release:        %autorelease
+Release:        %autorelease -e 0.riscv64
 Summary:        GTK web content engine library
 
 License:        LGPLv2
@@ -338,6 +338,11 @@ files for developing applications that use JavaScript engine from webkit2gtk-4.0
 %ifarch aarch64
   -DUSE_64KB_PAGE_BLOCK=ON \
 %endif
+%endif
+%ifarch riscv64
+  -DENABLE_JIT=OFF \
+  -DENABLE_C_LOOP=ON \
+  -DENABLE_SAMPLING_PROFILER=OFF \
 %endif
   %{nil}
 
@@ -357,6 +362,11 @@ files for developing applications that use JavaScript engine from webkit2gtk-4.0
 %ifarch aarch64
   -DUSE_64KB_PAGE_BLOCK=ON \
 %endif
+%endif
+%ifarch riscv64
+  -DENABLE_JIT=OFF \
+  -DENABLE_C_LOOP=ON \
+  -DENABLE_SAMPLING_PROFILER=OFF \
 %endif
   %{nil}
 
@@ -377,6 +387,11 @@ files for developing applications that use JavaScript engine from webkit2gtk-4.0
 %ifarch aarch64
   -DUSE_64KB_PAGE_BLOCK=ON \
 %endif
+%endif
+%ifarch riscv64
+  -DENABLE_JIT=OFF \
+  -DENABLE_C_LOOP=ON \
+  -DENABLE_SAMPLING_PROFILER=OFF \
 %endif
   %{nil}