Generate genlex rules from bp2build for cc targets

This change will cause bp2build to generate genlex targets any
time a .l or .ll file is present in the srcs for a cc target and
add those genlex targets to the srcs attribute of the original
target.

Bug: 207408632
Test: unit tests
Change-Id: I1bce82c9d3c3d458eae1cef547ffae3d6e975134
diff --git a/bazel/aquery.go b/bazel/aquery.go
index ee09d0b..b09bc09 100644
--- a/bazel/aquery.go
+++ b/bazel/aquery.go
@@ -628,7 +628,7 @@
 }
 
 func isSymlinkAction(a action) bool {
-	return a.Mnemonic == "Symlink" || a.Mnemonic == "SolibSymlink"
+	return a.Mnemonic == "Symlink" || a.Mnemonic == "SolibSymlink" || a.Mnemonic == "ExecutableSymlink"
 }
 
 func isTemplateExpandAction(a action) bool {