Use LLVM21 to build python314

Add patch gh138498-llvm-version-config.patch
bsc#1254826, gh#python/cpython#138498

python314.spec

@@ -54,6 +54,8 @@
 %bcond_with GIL
 %endif
 
+%define llvm_version 21
+
 %if 0%{?do_profiling} && !0%{?want_reproducible_builds}
 %bcond_without profileopt
 %else
@@ -209,6 +211,8 @@ Patch07:        bpo-31046_ensurepip_honours_prefix.patch
 # PATCH-FIX-SLE skip-test_pyobject_freed_is_freed.patch mcepl@suse.com
 # skip a test failing on SLE-15
 Patch09:        skip-test_pyobject_freed_is_freed.patch
+# PATCH-FIX-UPSTREAM gh138498-llvm-version-config gh#python/cpython#138498  daniel.garcia@suse.com
+Patch10:        gh138498-llvm-version-config.patch
 # PATCH-FIX-OPENSUSE CVE-2023-52425-libexpat-2.6.0-backport-15.6.patch
 # This problem on libexpat is patched on 15.6 without version
 # update, this patch changes the tests to match the libexpat provided
@@ -275,7 +279,7 @@ BuildRequires:  python3-python-docs-theme >= 2022.1
 
 %if %{with experimental_jit}
 # needed for experimental_jit
-BuildRequires:  clang19 llvm19
+BuildRequires:  clang%{llvm_version} llvm%{llvm_version}
 BuildRequires:  llvm
 %endif
 
@@ -581,6 +585,7 @@ sed -e 's/-fprofile-correction//' -i Makefile.pre.in
 %endif
 
 export CFLAGS="%{optflags} -IVendor/"
+export LLVM_VERSION=%{llvm_version}
 
 %configure \
     --with-platlibdir=%{_lib} \