Revert "package/meson: bump version to 0.50.0"

This reverts commit 114e9dcd28e1001b74689215ec669b8940dc3ea9.
Indeed, there is major issue with this version because c_std is not
passed anymore when cross-compiling:
https://github.com/mesonbuild/meson/issues/5097

As a result, some meson packages (at least systemd, libmpdclient,
glib-networking) fail to build

Fixes:
 - http://autobuild.buildroot.org/results/9eae2181fb3fcfe12481e5496b7d87c0dcd109eb
 - http://autobuild.buildroot.org/results/e828c7925d9247e14d8a8694febfee8ce6c86e81
 - http://autobuild.buildroot.org/results/031aee7cf12ad882727eb2da5e953fd8813b52e2

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>

package/meson/meson.hash

@@ -1,4 +1,4 @@
 # Locally calculated after checking pgp signature
-# https://github.com/mesonbuild/meson/releases/download/0.50.0/meson-0.50.0.tar.gz.asc
-sha256 2a1bc42dda58206fb922cda5e1ca95cc03ad126321d26acc47d3493ec4e7021f meson-0.50.0.tar.gz
+# https://github.com/mesonbuild/meson/releases/download/0.49.2/meson-0.49.2.tar.gz.asc
+sha256 ef9f14326ec1e30d3ba1a26df0f92826ede5a79255ad723af78a2691c37109fd meson-0.49.2.tar.gz
 sha256 cfc7749b96f63bd31c3c42b5c471bf756814053e847c10f3eb003417bc523d30 COPYING

package/meson/meson.mk

@@ -4,7 +4,7 @@
 #
 ################################################################################
 
-MESON_VERSION = 0.50.0
+MESON_VERSION = 0.49.2
 MESON_SITE = https://github.com/mesonbuild/meson/releases/download/$(MESON_VERSION)
 MESON_LICENSE = Apache-2.0
 MESON_LICENSE_FILES = COPYING