tau: %clang needs cmake for build (#28531)

* tau%clang needs cmake for build

* specify cmake@3.14:

var/spack/repos/builtin/packages/tau/package.py

@@ -93,6 +93,7 @@ class Tau(Package):
     variant('ppc64le', default=False, description='Build for IBM Power LE nodes')
     variant('x86_64', default=False, description='Force build for x86 Linux instead of auto-detect')
 
+    depends_on('cmake@3.14:', type='build', when='%clang')
     depends_on('zlib', type='link')
     depends_on('pdt', when='+pdt')  # Required for TAU instrumentation
     depends_on('scorep', when='+scorep')