Add external/one-true-awk.

Bug: http://b/69117476
Test: N/A --- currently empty project
Change-Id: Ieefae9a7de3a406e69b3ca35921c86668b59b352
Merged-In: Ieefae9a7de3a406e69b3ca35921c86668b59b352

default.xml

@@ -281,6 +281,7 @@
   <project path="external/objenesis" name="platform/external/objenesis" groups="pdk-cw-fs,pdk-fs" />
   <project path="external/oj-libjdwp" name="platform/external/oj-libjdwp" groups="pdk" />
   <project path="external/okhttp" name="platform/external/okhttp" groups="pdk-cw-fs,pdk-fs" />
+  <project path="external/one-true-awk" name="platform/external/one-true-awk" groups="pdk" />
   <project path="external/opencv" name="platform/external/opencv" groups="pdk-cw-fs,pdk-fs" />
   <project path="external/owasp/sanitizer" name="platform/external/owasp/sanitizer" groups="pdk-fs" />
   <project path="external/parameter-framework" name="platform/external/parameter-framework" groups="pdk-fs,pdk-cw-fs" />