[source] scripts: Probe external toolchains for libthread-db

[LEDE Commits]

jow pushed a commit to source.git, branch lede-17.01:
https://git.lede-project.org/827f108b42504bd468a771cf610373d16f8fd378

commit 827f108b42504bd468a771cf610373d16f8fd378
Author: Florian Fainelli <f.fainelli at gmail.com>
AuthorDate: Mon Apr 3 19:04:24 2017 -0700

    scripts: Probe external toolchains for libthread-db
    
    libthread-db is a package that can be configured for external
    toolchains, so let's have the script probe for it.
    
    Signed-off-by: Florian Fainelli <f.fainelli at gmail.com>
    (cherry picked from commit 6704410b158b47aecf507971ad2ee5e3db840e3a)
---
 scripts/ext-toolchain.sh | 1 +
 1 file changed, 1 insertion(+)

diff --git a/scripts/ext-toolchain.sh b/scripts/ext-toolchain.sh
index 09390c5..fbe8639 100755
--- a/scripts/ext-toolchain.sh
+++ b/scripts/ext-toolchain.sh
@@ -35,6 +35,7 @@ LIB_SPECS="
 	rt:       librt-* librt
 	pthread:  libpthread-* libpthread
 	stdcpp:   libstdc++
+	thread_db: libthread-db
 	gcc:      libgcc_s
 	ssp:      libssp
 	gfortran: libgfortran