[Buildroot] [git commit branch/2020.02.x] package/perl: fix configure when BR2_VERSION_FULL contains a '/'

commit: https://git.buildroot.net/buildroot/commit/?id=5b3896cb767868f1ab8293084f6528eec17bafb0
branch: https://git.buildroot.net/buildroot/commit/?id=refs/heads/2020.02.x

When BR2_VERSION_FULL contains one or more '/', injection our version
in the perl patch-level fails:

    /usr/bin/sed: -e expression #1, char 27: unknown option to `s'

When the build is done in a git tree, and HEAD is a tag, BR2_VERSION_FULL
will contain that tag name. Even if not widely common, it is not unusual
for a tag to contain a '/', and this is perfectly legit in git.

So, mangle BR2_VERSION_FULL to escape all '/' with a backslash '\', so
that the sed expression is correct, and so that we eventually have a
correct patchlevel string in perl's --version output.

Signed-off-by: Yann E. MORIN <redacted>
Cc: Francois Perrad <redacted>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
(cherry picked from commit 0a2141349c12fcab639182b744ec3e2e5ab5d1f7)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
---
 package/perl/perl.mk | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/package/perl/perl.mk b/package/perl/perl.mk
index 2f82e1d6d5..c053c98bbe 100644
--- a/package/perl/perl.mk
+++ b/package/perl/perl.mk

@@ -74,7 +74,7 @@ endif
 define PERL_CONFIGURE_CMDS
 	(cd $(@D); $(TARGET_MAKE_ENV) HOSTCC='$(HOSTCC_NOCCACHE)' \
 		./configure $(PERL_CONF_OPTS))
-	$(SED) 's/UNKNOWN-/Buildroot $(BR2_VERSION_FULL) /' $(@D)/patchlevel.h
+	$(SED) 's/UNKNOWN-/Buildroot $(subst /,\/,$(BR2_VERSION_FULL)) /' $(@D)/patchlevel.h
 endef
 
 define PERL_BUILD_CMDS