package/ustr: fix ldconfig for host build

The host build of the ustr package also needs to not run the ldconfig to
prevent a build failure caused by the symlink creating a race condition.
Related commit for target build change was 22069232.

Signed-off-by: Clayton Shotwell <clayton.shotwell@rockwellcollins.com>
Signed-off-by: Matt Weber <matthew.weber@rockwellcollins.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/ustr/ustr.mk

@@ -26,6 +26,7 @@ USTR_INSTALL_STAGING = YES
 USTR_MAKE_OPTS = all all-shared
 
 USTR_CONF_OPTS += LDCONFIG=/bin/true
+HOST_USTR_CONF_OPTS += LDCONFIG=/bin/true
 
 $(eval $(autotools-package))
 $(eval $(host-autotools-package))