add sf mirrors list in help (fix by Bernhard Fischer) and allow people to add custom prefix/suffix to builds

Config.in

@@ -100,7 +100,7 @@ config BR2_WGET
 	default "wget --passive-ftp -nd"
 
 config BR2_SVN
-        string "Subversion (svn) checkout command"
+	string "Subversion (svn) checkout command"
 	default "svn co"
 
 config BR2_TAR_VERBOSITY
@@ -108,7 +108,7 @@ config BR2_TAR_VERBOSITY
 	default n
 
 config BR2_SOURCEFORGE_MIRROR
-        string "Sourceforge mirror site"
+	string "Sourceforge mirror site"
 	default "easynews"
 	help
 	    Sourceforge has a system of mirror sites.  Some sites may be closer
@@ -116,6 +116,9 @@ config BR2_SOURCEFORGE_MIRROR
 	    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_STAGING_DIR
 	string "Toolchain and header file location?"
 	default "$(BUILD_DIR)/staging_dir"
@@ -129,6 +132,24 @@ config BR2_STAGING_DIR
 	    Most people will leave this set to the default value of
 	    "$(BUILD_DIR)/staging_dir".
 
+config BR2_TOPDIR_PREFIX
+	string "Custom build dir prefix"
+	default ""
+	help
+	    Add a custom string to the beginning of the build directories.
+
+	    build_ARCH -> [PREFIX]_build_ARCH
+	    toolchain_build_ARCH -> [PREFIX]_toolchain_build_ARCH
+
+config BR2_TOPDIR_SUFFIX
+	string "Custom build dir suffix"
+	default ""
+	help
+	    Add a custom string to the end of the build directories.
+
+	    build_ARCH -> build_ARCH_[SUFFIX]
+	    toolchain_build_ARCH -> toolchain_build_ARCH_[SUFFIX] 
+
 config BR2_JLEVEL
 	int "Number of jobs to run simultaneously"
 	default "1"