testing/sentinel-minipot: fix build on riscv64

I understand now what is going on, since check() is disabled on the
riscv64 package builder checkdepends is not installed, but check-dev
(not check) is a needed dependency, otherwise the configure script will
fail with

  checking for check >= 0.11... no
  configure: error: Package requirements (check >= 0.11) were not met:

  Package 'check', required by 'virtual:world', not found

  Consider adjusting the PKG_CONFIG_PATH environment variable if you
  installed software in a non-standard prefix.

  Alternatively, you may set the environment variables CHECK_CFLAGS
  and CHECK_LIBS to avoid the need to call pkg-config.
  See the pkg-config man page for more details.

testing/sentinel-minipot/APKBUILD

@@ -14,7 +14,6 @@ makedepends="
 	autoconf
 	automake
 	base64c-dev
-	check
 	czmq-dev
 	gperf
 	libevent-dev
@@ -33,6 +32,13 @@ source="https://gitlab.nic.cz/turris/sentinel/minipot/-/archive/v$pkgver/minipot
 	"
 builddir="$srcdir/minipot-v$pkgver"
 
+case "$CARCH" in
+riscv64)
+	# check() is disabled on the riscv64 package builder
+	makedepends="$makedepends $checkdepends"
+	;;
+esac
+
 prepare() {
 	default_prepare