Add support for prepatched toolchains

Config.in

@@ -564,43 +564,7 @@ config BR2_DL_DIR
 	help
 	  Directory to store all the source files that we need to fetch.
 
-config BR2_SOURCEFORGE_MIRROR
-	string "Sourceforge mirror site"
-	default "easynews"
-	help
-	  Sourceforge has a system of mirror sites.  Some sites may be closer
-	  to your location, and sometimes mirror sites go down and are no longer
-	  available.  This option allows you to select your preferred Sourceforge
-	  mirror site.
-
-	  The list of mirrors is available here:
-	  http://prdownloads.sourceforge.net/index-sf.html?download
-
-config BR2_ATMEL_MIRROR
-	depends BR2_TARGET_ATMEL && (BR2_avr32 || BR2_arm)
-	string "Atmel AVR32/AT91 download site"
-	default "ftp://at91dist:distrib@81.80.104.162/AT91_Third_Party_Design_Flow/Linux_Host/"
-	help
-	  Unofficial site for AVR32/AT91 Buildroot patches, or your local mirror.
-	  Atmel does not currently support buildroot, but this site makes
-	  available neccessary patches and prepatched packages useful
-	  to extend a buildroot for AVR32 or AT91 ARM based boards.
-	  Issues with contents of this server needs to be highlighted
-	  on the buildroot mailing list and
-	  should not be addressed directly to Atmel
-	  Atmel provides support for their AVR32 chips on 
-	  http://avr32linux.org/ or http://www.avrfreaks.net/
-	  Atmel provides support for AT91 chips on www.at91.com.
-	  Commercial AT91 Linux support is through www.timesys.com
-	  Community  AT91 Linux support is through http://maxim.org.za/AT91_26.html
-
-config BR2_AT91_PATCH_MIRROR
-	depends BR2_TARGET_ATMEL && BR2_arm
-	string "Atmel AT91 Linux Patch download site"
-	default "http://maxim.org.za/AT91RM9200/2.6/"
-	help
-	  Patches for the AT91 generated by the Linux community
-	  usually ends up here, courtesy of Andrew Victor
+source	"target/device/Mirrors.in"
 	  
 config BR2_STAGING_DIR
 	string "Toolchain and header file location?"