Restore OMF build and re-enable tests for MODEL=32omf

To restore the coverage until the deprecation ends

.azure-pipelines/windows.sh

@@ -98,9 +98,6 @@ done
 # Run DMD testsuite
 ################################################################################
 
-# Temporarily disabled because other components need to be updated as well
-if [ "$MODEL" != "32omf" ] ; then
-
 cd "$DMD_DIR/test"
 
 # build run.d testrunner and its tools while host compiler is untampered
@@ -134,8 +131,6 @@ if [ "$HOST_DMD_VERSION" = "2.079.0" ] ; then
 fi
 CC="$CC" ./run --environment --jobs=$N "${targets[@]}" "${args[@]}"
 
-fi
-
 ###############################################################################
 # Upload coverage reports and exit if ENABLE_COVERAGE is specified
 ################################################################################

azure-pipelines.yml

@@ -32,6 +32,10 @@ jobs:
           OS: Win_64
           MODEL: 64
           ARCH: x64
+        x86-OMF:
+          OS: Win_32
+          MODEL: 32omf
+          ARCH: x86
     steps:
       - template: .azure-pipelines/windows.yml
       - template: .azure-pipelines/windows-artifact.yml