versioner: Build SymbolDatabase from version scripts

This commit adds a version script parser so that versioner can build
SymbolDatabase from version scripts.

Bug: 113263746
Test: ./bionic/tools/versioner/run_tests.py
Change-Id: Iedcfe36b51a62693668e07b86aa13592096262db
diff --git a/tools/versioner/src/Android.bp b/tools/versioner/src/Android.bp
index f138cc3..c3721ef 100644
--- a/tools/versioner/src/Android.bp
+++ b/tools/versioner/src/Android.bp
@@ -14,6 +14,7 @@
         "Driver.cpp",
         "Preprocessor.cpp",
         "SymbolDatabase.cpp",
+        "SymbolFileParser.cpp",
         "Utils.cpp",
         "VFS.cpp",
     ],