Added external URLs for downloading binutils. (#260)

* Renamed TIMEMORY_BINUTILS_DOWNLOAD_URL to BINUTILS_DOWNLOAD_URL.

This change is part of the fix for SWDEV-471917.

* Cleaned up code that deals with mirrors for binutils.

* Renamed BINUTILS_DOWNLOAD_URL back to TIMEMORY_BINUTILS_DOWNLOAD_URL.

cmake/Modules/ConfigBinutils.cmake

@@ -70,21 +70,14 @@ mark_as_advanced(binutils_CONFIG_FLAGS)
 # needed for configure command
 string(REPLACE " " ";" _binutils_CONFIG_FLAGS "${binutils_CONFIG_FLAGS}")
 
-# List of URLS (includes mirrors) to download binutils from.
-set(TIMEMORY_BINUTILS_DOWNLOAD_URL
-    ""
-    CACHE STRING "URLs for binutils download")
-
-# Add defualt URLs to download binutils from.
-list(APPEND TIMEMORY_BINUTILS_DOWNLOAD_URL
-     "http://ftpmirror.gnu.org/gnu/binutils/binutils-2.40.tar.gz"
-     "http://mirrors.kernel.org/sourceware/binutils/releases/binutils-2.40.tar.gz")
-
 include(ExternalProject)
 externalproject_add(
     binutils-external
     PREFIX ${PROJECT_BINARY_DIR}/external/binutils
-    URL ${TIMEMORY_BINUTILS_DOWNLOAD_URL}
+    URL
+        ${TIMEMORY_BINUTILS_DOWNLOAD_URL}
+        http://ftpmirror.gnu.org/gnu/binutils/binutils-2.40.tar.gz
+        http://mirrors.kernel.org/sourceware/binutils/releases/binutils-2.40.tar.gz
     BUILD_IN_SOURCE 1
     CONFIGURE_COMMAND
         ${CMAKE_COMMAND} -E env CC=${CMAKE_C_COMPILER} CFLAGS=-fPIC\ -O3