toolchain/external: newer Linaro toolchains do not provide source code

Currently, we have a pattern-matching that automatically derives the
the source tarball filename from the binary tarball filename.

However, the latest Linaro toolchains no longer follow that scheme (and
do not even readily provide the sources...).

Remove the generic pattern-matching, and explicitly set the source
tarball name for those toolchains that do have a source tarball readily
available.

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Cc: Romain Naour <romain.naour@openwide.fr>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

toolchain/toolchain-external/toolchain-external.mk

@@ -297,6 +297,7 @@ else ifeq ($(BR2_TOOLCHAIN_EXTERNAL_LINARO_ARM),y)
 ifeq ($(HOSTARCH),x86)
 TOOLCHAIN_EXTERNAL_SITE = http://releases.linaro.org/14.09/components/toolchain/binaries
 TOOLCHAIN_EXTERNAL_SOURCE = gcc-linaro-arm-linux-gnueabihf-4.9-2014.09_linux.tar.xz
+TOOLCHAIN_EXTERNAL_ACTUAL_SOURCE_TARBALL = gcc-linaro-arm-linux-gnueabihf-4.9-2014.09_src.tar.bz2
 TOOLCHAIN_EXTERNAL_POST_INSTALL_STAGING_HOOKS += TOOLCHAIN_EXTERNAL_LINARO_ARMHF_SYMLINK
 else
 TOOLCHAIN_EXTERNAL_SITE = http://releases.linaro.org/components/toolchain/binaries/5.2-2015.11-2/arm-linux-gnueabihf
@@ -306,6 +307,7 @@ else ifeq ($(BR2_TOOLCHAIN_EXTERNAL_LINARO_ARMEB),y)
 ifeq ($(HOSTARCH),x86)
 TOOLCHAIN_EXTERNAL_SITE = http://releases.linaro.org/14.09/components/toolchain/binaries
 TOOLCHAIN_EXTERNAL_SOURCE = gcc-linaro-armeb-linux-gnueabihf-4.9-2014.09_linux.tar.xz
+TOOLCHAIN_EXTERNAL_ACTUAL_SOURCE_TARBALL = gcc-linaro-armeb-linux-gnueabihf-4.9-2014.09_src.tar.bz2
 TOOLCHAIN_EXTERNAL_POST_INSTALL_STAGING_HOOKS += TOOLCHAIN_EXTERNAL_LINARO_ARMEBHF_SYMLINK
 else
 TOOLCHAIN_EXTERNAL_SITE = http://releases.linaro.org/components/toolchain/binaries/5.2-2015.11-2/armeb-linux-gnueabihf
@@ -350,6 +352,7 @@ else ifeq ($(BR2_TOOLCHAIN_EXTERNAL_LINARO_AARCH64),y)
 ifeq ($(HOSTARCH),x86)
 TOOLCHAIN_EXTERNAL_SITE = http://releases.linaro.org/14.09/components/toolchain/binaries
 TOOLCHAIN_EXTERNAL_SOURCE = gcc-linaro-aarch64-linux-gnu-4.9-2014.09_linux.tar.xz
+TOOLCHAIN_EXTERNAL_ACTUAL_SOURCE_TARBALL = gcc-linaro-aarch64-linux-gnu-4.9-2014.09_src.tar.bz2
 TOOLCHAIN_EXTERNAL_POST_INSTALL_STAGING_HOOKS += TOOLCHAIN_EXTERNAL_LINARO_AARCH64_SYMLINK
 else
 TOOLCHAIN_EXTERNAL_SITE = http://releases.linaro.org/components/toolchain/binaries/5.2-2015.11-2/aarch64-linux-gnu
@@ -406,9 +409,6 @@ endif
 ifneq ($(findstring sourcery.mentor.com/public/gnu_toolchain,$(TOOLCHAIN_EXTERNAL_SITE)),)
 TOOLCHAIN_EXTERNAL_ACTUAL_SOURCE_TARBALL ?= \
 	$(subst -i686-pc-linux-gnu.tar.bz2,.src.tar.bz2,$(subst -i686-pc-linux-gnu-i386-linux.tar.bz2,-i686-pc-linux-gnu.src.tar.bz2,$(TOOLCHAIN_EXTERNAL_SOURCE)))
-else ifneq ($(findstring http://releases.linaro.org,$(TOOLCHAIN_EXTERNAL_SITE)),)
-TOOLCHAIN_EXTERNAL_ACTUAL_SOURCE_TARBALL ?= \
-	$(subst _linux.tar.xz,_src.tar.bz2,$(TOOLCHAIN_EXTERNAL_SOURCE))
 endif
 
 # In fact, we don't need to download the toolchain, since it is already