package/exfat{,-utils}: fix installation path of the helper/utilities

"mount" from the "util-linux" package does expect the helper utilities
in "/sbin" and not "/usr/sbin". We use "--exec-prefix=/" to fix the
issue. The man-pages are then still installed under "/usr/share/man".

Signed-off-by: Wolfgang Grandegger <wg@grandegger.com>
Tested-by: Carlos Santos <unixmania@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
(cherry picked from commit e7f32dc3c63668b37e338bae3b7a82efe247d793)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/exfat-utils/exfat-utils.mk

@@ -9,4 +9,6 @@ EXFAT_UTILS_SITE = https://github.com/relan/exfat/releases/download/v$(EXFAT_UTI
 EXFAT_UTILS_LICENSE = GPL-3.0+
 EXFAT_UTILS_LICENSE_FILES = COPYING
 
+EXFAT_UTILS_CONF_OPTS += --exec-prefix=/
+
 $(eval $(autotools-package))

package/exfat/exfat.mk

@@ -12,4 +12,6 @@ EXFAT_LICENSE = GPL-3.0+
 EXFAT_LICENSE_FILES = COPYING
 EXFAT_CFLAGS = $(TARGET_CFLAGS) -std=c99
 
+EXFAT_CONF_OPTS += --exec-prefix=/
+
 $(eval $(autotools-package))