dash: correct licence

According to its copyright file, dash is only BSD-3-Clause. It has
a build time tool from bash that's under the GPL, but only the
tool's output is used, not the tool itself. So all compiled artefacts
in dash appear to share the same licence.

Signed-off-by: Dan McGregor <dan.mcgregor@usask.ca>
Signed-off-by: Khem Raj <raj.khem@gmail.com>
(cherry picked from commit 8eba35f8b0)
Signed-off-by: Gyorgy Sarvari <skandigraun@gmail.com>

meta-oe/recipes-shells/dash/dash_0.5.11.5.bb

@@ -2,7 +2,7 @@ SUMMARY = "Small and fast POSIX-compliant shell"
 HOMEPAGE = "http://gondor.apana.org.au/~herbert/dash/"
 SECTION = "System Environment/Shells"
 
-LICENSE = "BSD-3-Clause & GPL-2.0-or-later"
+LICENSE = "BSD-3-Clause"
 LIC_FILES_CHKSUM = "file://COPYING;md5=b5262b4a1a1bff72b48e935531976d2e"
 
 inherit autotools update-alternatives