package/mariadb: really use system fmt

Commit 821f9dee8112dc02fe58d60273d0dfdabbc46d1f wrongly used WITH_FMT
instead of WITH_LIBFMT resulting in the following build failure:

[  0%] Creating directories for 'libfmt'
[  0%] Performing download step (download, verify and extract) for 'libfmt'
make[3]: Leaving directory '/home/buildroot/autobuild/run/instance-0/output-1/build/mariadb-10.11.6'
make[3]: Leaving directory '/home/buildroot/autobuild/run/instance-0/output-1/build/mariadb-10.11.6'
-- Downloading...
   dst='/home/buildroot/autobuild/run/instance-0/output-1/build/mariadb-10.11.6/extra/libfmt/src/8.0.1.zip'
   timeout='none'
   inactivity timeout='none'
-- Using src='https://github.com/fmtlib/fmt/archive/refs/tags/8.0.1.zip'
CMake Error at libfmt-stamp/download-libfmt.cmake:170 (message):
  Each download failed!

    error: downloading 'https://github.com/fmtlib/fmt/archive/refs/tags/8.0.1.zip' failed
          status_code: 1
          status_string: "Unsupported protocol"
          log:
          --- LOG BEGIN ---
          Protocol "https" not supported or disabled in libcurl

  Closing connection

          --- LOG END ---

Fixes: 821f9dee8112dc02fe58d60273d0dfdabbc46d1f
 - http://autobuild.buildroot.org/results/fbe3bc347a83a810ffbbbff93a45994963712bee

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/mariadb/mariadb.mk

@@ -26,7 +26,7 @@ MARIADB_DEPENDENCIES = \
 	libxml2
 
 MARIADB_CONF_OPTS += \
-	-DWITH_FMT=system \
+	-DWITH_LIBFMT=system \
 	-DWITH_PCRE=system
 
 # use bundled GPL-2.0+ licensed readline as package/readline is GPL-3.0+