[AMDGPU][libc] Disallow collapsing of requests (#336)

We have seen on this bot in particular issues with picking up a breaking
change and some NFC change. This leads to the bot not commenting on the
PR.

Author: jplehr

buildbot/osuosl/master/config/builders.py

@@ -1959,6 +1959,7 @@
     {'name' : "openmp-offload-libc-amdgpu-runtime",
     'tags'  : ["openmp"],
     'workernames' : ["omp-vega20-1"],
+    'collapseRequests' : False,
     'builddir': "openmp-offload-libc-amdgpu-runtime",
     'factory' : OpenMPBuilder.getOpenMPCMakeBuildFactory(
                         clean=True,