package/binutils: fix typo in variable name

Commit 7ff21f8d4b94 (package/binutils: handle gprofng as an optional
feature) introduced the typo. Although it was noticed, the commit was
not amended before being pushed...

Fix that now...

Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>

package/binutils/binutils.mk

@@ -94,9 +94,9 @@ HOST_BINUTILS_CONF_OPTS = \
 
 ifeq ($(BR2_BINUTILS_GPROFNG),y)
 HOST_BINUTILS_DEPENDENCIES += host-bison
-HOST_INBUTILS_CONF_OPTS += --enable-gprofng
+HOST_BINUTILS_CONF_OPTS += --enable-gprofng
 else
-HOST_INBUTILS_CONF_OPTS += --disable-gprofng
+HOST_BINUTILS_CONF_OPTS += --disable-gprofng
 endif
 
 # binutils run configure script of subdirs at make time, so ensure