Rewrite depfile from sbox to stay reproducible

sbox will generate a random directory for the output root, and most
tools will encode that directory name in the output target of the
depfile.

So embed the library from dep_fixer into sbox so that it can rewrite the
output filename to a static (reproducible) value. Ninja doesn't care
what that value is, so it's just "outputfile".

Also fix up rule_builder to actually tell sbox about the depfile.

Test: mmma system/iorap; check the contents of:
out/soong/.intermediates/system/iorap/libiorap-binder/android_arm_armv7-a-neon_core_static/gen/aidl/system/iorap/binder/com/google/android/startop/iorap/IIorap.cpp.d

Change-Id: I3640a2e8b0c034f143a35e398a8418a6d621b265
diff --git a/cmd/dep_fixer/main.go b/cmd/dep_fixer/main.go
index f94cf2f..d1bd139 100644
--- a/cmd/dep_fixer/main.go
+++ b/cmd/dep_fixer/main.go
@@ -25,6 +25,8 @@
 	"io/ioutil"
 	"log"
 	"os"
+
+	"android/soong/makedeps"
 )
 
 func main() {
@@ -39,7 +41,7 @@
 		log.Fatal("Expected at least one input file as an argument")
 	}
 
-	var mergedDeps *Deps
+	var mergedDeps *makedeps.Deps
 	var firstInput []byte
 
 	for i, arg := range flag.Args() {
@@ -48,7 +50,7 @@
 			log.Fatalf("Error opening %q: %v", arg, err)
 		}
 
-		deps, err := Parse(arg, bytes.NewBuffer(append([]byte(nil), input...)))
+		deps, err := makedeps.Parse(arg, bytes.NewBuffer(append([]byte(nil), input...)))
 		if err != nil {
 			log.Fatalf("Failed to parse: %v", err)
 		}