#2100: Disable unity builds for gcc 7/8

Author: PhilMiller

scripts/workflows-azure.ini

@@ -95,6 +95,7 @@ compiler = gcc-7
 distro = 18.04
 vt_trace = 1
 vt_trace_rt = 1
+vt_unity_build = 0
 code_coverage = 1
 docker_target = "[% linux %]-cpp-clean-noinstall"
 output_name = ci/azure/azure-gcc-7-ubuntu-mpich.yml
@@ -107,6 +108,7 @@ distro = 18.04
 vt_trace = 1
 vt_pool = 0
 vt_asan = 1
+vt_unity_build = 0
 output_name = ci/azure/azure-gcc-8-ubuntu-mpich.yml
 lsan_options = suppressions=/vt/tests/lsan.supp