sysutils/pesign: Deprecate and use GCC 10

- Unmaintaned since 2016.
- Very much out of date.
- Does not build with GCC 11 [1]: set USE_GCC=10 so that the port does
  not block GCC default version update to GCC 11 while waiting for
  expiration.

PR:		263544 [1]
Reported by:	exp-run (antoine@) [1]
Approved by:	gerald (mentor)
Differential Revision:	https://reviews.freebsd.org/D35086

sysutils/pesign/Makefile

@@ -13,13 +13,16 @@ COMMENT=	Signing utility for UEFI secure boot
 
 LICENSE=	GPLv2
 
+DEPRECATED=	Unmaintaned since 2016, very much out of date, does not build with GCC 11 (PR \#263544)
+EXPIRATION_DATE=	2022-07-01
+
 LIB_DEPENDS=	libefivar.so.0:devel/efivar \
 		libnspr4.so:devel/nspr \
 		libnss3.so:security/nss \
 		libpopt.so:devel/popt \
 		libuuid.so:misc/e2fsprogs-libuuid
 
-USE_GCC=	yes
+USE_GCC=	10
 USE_GITHUB=	yes
 GH_ACCOUNT=	rhinstaller