texconv: Fix PFM reader to avoid overread of buffer (#413)

* texconv: Fix PFM reader to avoid overread of buffer

* More code review

* Max memory usage

* YAML fix

build/DirectXTex-SDL.yml

@@ -32,6 +32,8 @@ pool:
 jobs:
 - job: SDL_BUILD
   displayName: 'Build using required SDL tools'
+  workspace:
+    clean: all
   steps:
   - checkout: self
     clean: true

build/OneFuzzConfig.json

@@ -12,7 +12,10 @@
       "OneFuzzJobs": [
         {
           "ProjectName": "Direct3D",
-          "TargetName": "DirectXTex"
+          "TargetName": "DirectXTex",
+          "TargetOptions": [
+             "-rss_limit_mb=4096"
+          ]
         }
       ],
       "JobDependencies": [