Clean up trailing whitespace in the kernel headers.

And fix the scripts so they stop letting trailing whitespace through.

Change-Id: Ie109fbe1f63321e565ba0fa60fee8e9cf3a61cfc
diff --git a/libc/kernel/common/linux/mmc/host.h b/libc/kernel/common/linux/mmc/host.h
index 22f4262..87352e5 100644
--- a/libc/kernel/common/linux/mmc/host.h
+++ b/libc/kernel/common/linux/mmc/host.h
@@ -92,7 +92,7 @@
  u32 ocr_avail;
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
  unsigned long caps;
-#define MMC_CAP_4_BIT_DATA (1 << 0)  
+#define MMC_CAP_4_BIT_DATA (1 << 0)
  unsigned int max_seg_size;
  unsigned short max_hw_segs;
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */