Bug 1189892: actually run linux(32) jobs everywhere; r=ted.mielczarek

This cleans up some redundant keys in `branches/try/job_flags.yml`, spells
the platform correctly (`linux`, not `linux32`), and defines the platform in
`base_job_flags.yml`

--HG--
extra : commitid : Ke1t5QKYYw9
extra : rebase_source : b95739ed88360f55cf7e8614e3e69c15f924c237

testing/taskcluster/tasks/branches/base_job_flags.yml

@@ -35,7 +35,7 @@ flags:
     - aries-eng
     - aries-dogfood
     - android-api-11
-    - linux32
+    - linux
     - linux64
     - linux64-st-an
     - macosx64

testing/taskcluster/tasks/branches/base_jobs.yml

@@ -122,6 +122,14 @@ builds:
     types:
       opt:
         task: tasks/builds/b2g_nexus_5l_eng.yml
+  linux:
+    platforms:
+      - Linux
+    types:
+      opt:
+        task: tasks/builds/opt_linux32.yml
+      debug:
+        task: tasks/builds/dbg_linux32.yml
   linux64:
     platforms:
       - Linux64

testing/taskcluster/tasks/branches/try/job_flags.yml

@@ -129,14 +129,6 @@ builds:
     types:
       opt:
         task: tasks/builds/android_api_11.yml
-  linux64:
-    platforms:
-      - Linux64
-    types:
-      opt:
-        task: tasks/builds/opt_linux64_clobber.yml
-      debug:
-        task: tasks/builds/dbg_linux64_clobber.yml
   linux:
     platforms:
       - Linux
@@ -145,12 +137,6 @@ builds:
         task: tasks/builds/opt_linux32_clobber.yml
       debug:
         task: tasks/builds/dbg_linux32_clobber.yml
-  macosx64:
-    platforms:
-      - MacOSX64
-    types:
-      debug:
-        task: tasks/builds/dbg_macosx64.yml
   sm-plain:
     platforms:
       - Linux64