Use String8/16 c_str [tools]

Bug: 295394788
Test: make checkbuild
Change-Id: I82d6899d8c15a10b15399c39177290012bb5f13b
diff --git a/tools/aapt/ApkBuilder.cpp b/tools/aapt/ApkBuilder.cpp
index 01e02e2..335c43b 100644
--- a/tools/aapt/ApkBuilder.cpp
+++ b/tools/aapt/ApkBuilder.cpp
@@ -36,7 +36,7 @@
             if (splitConfigs.count(*iter) > 0) {
                 // Can't have overlapping configurations.
                 fprintf(stderr, "ERROR: Split configuration '%s' is already defined "
-                        "in another split.\n", iter->toString().string());
+                        "in another split.\n", iter->toString().c_str());
                 return ALREADY_EXISTS;
             }
         }
@@ -115,10 +115,10 @@
 }
 
 void ApkSplit::print() const {
-    fprintf(stderr, "APK Split '%s'\n", mName.string());
+    fprintf(stderr, "APK Split '%s'\n", mName.c_str());
 
     std::set<OutputEntry>::const_iterator iter = mFiles.begin();
     for (; iter != mFiles.end(); iter++) {
-        fprintf(stderr, "  %s (%s)\n", iter->getPath().string(), iter->getFile()->getSourceFile().string());
+        fprintf(stderr, "  %s (%s)\n", iter->getPath().c_str(), iter->getFile()->getSourceFile().c_str());
     }
 }