[zorg] Enable flang examples on a few builders

[rovka]

Summary

flang-aarch64-rel-assert (which uses static libs) and
flang-aarch64-sharedlibs (which should be relevant for testing the
plugin support).

[awarzynski]

Thank you for this! LGTM

buildbot/osuosl/master/config/builders.py

# Flang builders.
     'factory' : UnifiedTreeBuilder.getCmakeWithNinjaBuildFactory(
                     clean=True,
                     checks=['check-flang'],
                     depends_on_projects=['llvm','mlir','clang','flang'],
                     extra_configure_args=[
                         "-DLLVM_TARGETS_TO_BUILD=AArch64",
                         "-DBUILD_SHARED_LIBS=ON",
                         "-DLLVM_BUILD_EXAMPLES=ON",
+                        "-DFLANG_BUILD_EXAMPLES=ON",
                         "-DCMAKE_CXX_STANDARD=17",
                     ])},
 
     {'name' : "flang-aarch64-out-of-tree",
     'tags'  : ["flang"],
     'workernames' : ["linaro-flang-aarch64-out-of-tree"],
     'builddir': "flang-aarch64-out-of-tree",
     'factory' : FlangBuilder.getFlangOutOfTreeBuildFactory(
# Flang builders.
     'builddir': "flang-aarch64-rel-assert",
     'factory' : UnifiedTreeBuilder.getCmakeWithNinjaBuildFactory(
                     clean=True,
                     checks=['check-flang'],
                     depends_on_projects=['llvm','mlir','clang','flang'],
                     extra_configure_args=[
                         "-DLLVM_TARGETS_TO_BUILD=AArch64",
                         "-DLLVM_ENABLE_ASSERTIONS=ON",
+                        "-DFLANG_BUILD_EXAMPLES=ON",
                         "-DCMAKE_BUILD_TYPE=Release",
                         "-DCMAKE_CXX_STANDARD=17",
                     ])},
 
     {'name' : "flang-aarch64-latest-gcc",
     'tags'  : ['flang'],
     'workernames' : ["linaro-flang-aarch64-latest-gcc"],
     'builddir': "flang-aarch64-latest-gcc",