undo temporary alignment hack

Remove the memory alignment that mysteriously made OTA installs work,
in anticipation of a kernel that fixes the actual problem.  Handle
EINTR properly.
diff --git a/minzip/Zip.h b/minzip/Zip.h
index 57c0abd..1c1df2f 100644
--- a/minzip/Zip.h
+++ b/minzip/Zip.h
@@ -56,14 +56,6 @@
 } UnterminatedString;
 
 /*
- * The information we pass down to writeProcessFunction.
- */
-typedef struct {
-    int fd;
-    unsigned char* aligned_buffer;
-} WriteInfo;
-
-/*
  * Open a Zip archive.
  *
  * On success, returns 0 and populates "pArchive".  Returns nonzero errno
@@ -174,7 +166,7 @@
  * Inflate and write an entry to a file.
  */
 bool mzExtractZipEntryToFile(const ZipArchive *pArchive,
-    const ZipEntry *pEntry, WriteInfo *wi);
+    const ZipEntry *pEntry, int fd);
 
 /*
  * Inflate all entries under zipDir to the directory specified by