imx-bootlets: refresh patches

Tidy this up a little.

Signed-off-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>

package/boot/imx-bootlets/patches/001-skip_sb_generation.patch

@@ -1,6 +1,6 @@
---- imx-bootlets-src-10.05.02.orig/Makefile	2010-05-14 06:56:28.000000000 +0200
-+++ imx-bootlets-src-10.05.02/Makefile	2012-10-24 21:41:44.000000000 +0200
-@@ -32,10 +32,11 @@
+--- a/Makefile
++++ b/Makefile
+@@ -32,10 +32,11 @@ ifeq "$(DFT_IMAGE)" "$(wildcard $(DFT_IM
  	sed -i 's,[^ *]image.*;,\timage="$(DFT_UBOOT)";,' uboot.db
  	elftosb2 -z -c ./uboot.db -o i$(ARCH)_uboot.sb
  else