[Buildroot] [git commit branch/2021.05.x] package/strongswan: fix broken dependency relation

commit: https://git.buildroot.net/buildroot/commit/?id=690cae3a670441ee746a832df2f1f151e3ccacac
branch: https://git.buildroot.net/buildroot/commit/?id=refs/heads/2021.05.x

The AKA backend for 3GPP2 requires libgmp (see
https://wiki.strongswan.org/projects/strongswan/wiki/Autoconf). Since
the AKA backend for 3GPP2 is included by BR2_PACKAGE_STRONGSWAN_EAP,
when selecting a crypto backend different from
BR2_PACKAGE_STRONGSWAN_GMP, there is no guarantee the gmp package is
selected as well. When doing so, make fails since the package is in the
dependency chain but not selected:

  $ make
  Makefile:585: *** gmp is in the dependency chain of strongswan that has added it to its _DEPENDENCIES variable without selecting it or depending on it from Config.in.  Stop.
  make: *** [Makefile:23: _all] Error 2

To fix this, select BR2_PACKAGE_GMP when selecting BR2_PACKAGE_STRONGSWAN_EAP.

Signed-off-by: Martin Elshuber <redacted>
Signed-off-by: Yann E. MORIN <redacted>
(cherry picked from commit 363613a698ab1c6bab6b000e964f9c68ba4a552d)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
---
 package/strongswan/Config.in | 1 +
 1 file changed, 1 insertion(+)

diff --git a/package/strongswan/Config.in b/package/strongswan/Config.in
index 47c7107f59..368cd1ecc0 100644
--- a/package/strongswan/Config.in
+++ b/package/strongswan/Config.in

@@ -75,6 +75,7 @@ config BR2_PACKAGE_STRONGSWAN_TNCCS_DYNAMIC
 
 config BR2_PACKAGE_STRONGSWAN_EAP
 	bool "Enable EAP protocols"
+	select BR2_PACKAGE_GMP
 	help
 	  Enable various EAP protocols:
 	    - mschapv2

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