Merge pull request #23555 from Thyre/20250731223335_new_pr_LLVM2018

Add missing `libffi` dependency to LLVM 20.1.8

Author: branfosj

easybuild/easyconfigs/l/LLVM/LLVM-20.1.8-GCCcore-14.3.0.eb

@@ -45,6 +45,7 @@ builddependencies = [
 ]
 
 dependencies = [
+    ('libffi', '3.5.1'),
     ('libxml2', '2.14.3'),
     ('ncurses', '6.5'),
     ('zlib', '1.3.1'),