package/mmc-utils: bump to 523d8f3cfb21

Upstream commit f884bfe684f2c31e1f5b7c9247b364178fa20ea3 changed the
default build behavior to run `sparse` which is problematic if the tool
is not available on the host during builds.

Update the build command to not define `C` so `sparse` is skipped.

Signed-off-by: Vincent Fazio <vfazio@xes-inc.com>
Signed-off-by: Julien Olivain <ju.o@free.fr>

package/mmc-utils/mmc-utils.hash

@@ -1,3 +1,3 @@
 # Locally computed
-sha256  4547b5f0f8a43857dcfb516b8b9c987d07febfecbe3d27987f43064db46ca8f9  mmc-utils-e1281d4de9166b7254ba30bb58f9191fc2c9e7fb-git4.tar.gz
+sha256  1ae5706ce56bfedda94a01e87c5151ac750fb849987aeb74ff89d70f43556131  mmc-utils-523d8f3cfb219d800f45860892e742e3a355f1bb-git4.tar.gz
 sha256  4207d81122a02555f78c5a11b61c83a331ee03dc933e1ef9dd932ef9b434d12d  README

package/mmc-utils/mmc-utils.mk

@@ -4,7 +4,7 @@
 #
 ################################################################################
 
-MMC_UTILS_VERSION = e1281d4de9166b7254ba30bb58f9191fc2c9e7fb
+MMC_UTILS_VERSION = 523d8f3cfb219d800f45860892e742e3a355f1bb
 MMC_UTILS_SITE = https://git.kernel.org/pub/scm/utils/mmc/mmc-utils.git
 MMC_UTILS_SITE_METHOD = git
 MMC_UTILS_LICENSE = GPL-2.0
@@ -25,7 +25,7 @@ endif
 # let's do this here otherwise it won't be automatically set and build
 # will fail
 define MMC_UTILS_BUILD_CMDS
-	$(MAKE) -C $(@D) $(TARGET_CONFIGURE_OPTS) \
+	$(MAKE) -C $(@D) $(TARGET_CONFIGURE_OPTS) C= \
 		CFLAGS="$(MMC_UTILS_CFLAGS)" \
 		AM_CFLAGS='-DVERSION=\"$(shell echo $(MMC_UTILS_VERSION) | head -c 6)\"'
 endef