devel/llvm19: Fix !CLANG plist and OPENMP

llvm-debuginfo-analyzer isn't part of Clang, but was matched by the
overly broad pattern -analyzer. [0]

Fix USE_LDCONFIG for OPENMP. [1]

Reported by: jrtc27 [0], tijl [1]
Sponsored by: DARPA, AFRL

(cherry picked from commit e08503b86df7a69d55575669966a0dae54f84e93)