recovery: turn on text display for install errors in debug builds

Hopefully this will reduce the number of OTA "bugs" reported that are
really just someone having changed their system partition,
invalidating future incremental OTAs.

Also fixes a longstanding TODO about putting LOGE() output in the
on-screen display.

Change-Id: I44e5be65b2dee7ebce2cce28ccd920dc3d6e522e
diff --git a/verifier_test.cpp b/verifier_test.cpp
index 7fab547..1063cba 100644
--- a/verifier_test.cpp
+++ b/verifier_test.cpp
@@ -18,6 +18,7 @@
 #include <stdlib.h>
 #include <stdarg.h>
 
+#include "common.h"
 #include "verifier.h"
 #include "ui.h"
 #include "mincrypt/sha.h"
@@ -115,13 +116,10 @@
     bool IsTextVisible() { return false; }
     bool WasTextEverVisible() { return false; }
     void Print(const char* fmt, ...) {
-        char buf[256];
         va_list ap;
         va_start(ap, fmt);
-        vsnprintf(buf, 256, fmt, ap);
+        vfprintf(stderr, fmt, ap);
         va_end(ap);
-
-        fputs(buf, stderr);
     }
 
     void StartMenu(const char* const * headers, const char* const * items,
@@ -130,6 +128,14 @@
     void EndMenu() { }
 };
 
+void
+ui_print(const char* format, ...) {
+    va_list ap;
+    va_start(ap, format);
+    vfprintf(stdout, format, ap);
+    va_end(ap);
+}
+
 int main(int argc, char **argv) {
     if (argc < 2 || argc > 4) {
         fprintf(stderr, "Usage: %s [-sha256] [-f4 | -file <keys>] <package>\n", argv[0]);