Revert "package/libnss: enable parallel building"

This reverts commit 31602d8aaabaa9f55048c3db7a1b1b2fb2d27ef2 as it seems
that libnss still have parallel build issues.

Fixes:
 - http://autobuild.buildroot.org/results/521aaf8b41686865ea86688ea6410418b422fd55

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>

package/libnss/libnss.mk

@@ -69,12 +69,12 @@ endif
 endif
 
 define LIBNSS_BUILD_CMDS
-	$(TARGET_CONFIGURE_OPTS) $(MAKE) -C $(@D)/nss coreconf \
+	$(TARGET_CONFIGURE_OPTS) $(MAKE1) -C $(@D)/nss coreconf \
 		SOURCE_MD_DIR=$(@D)/$(LIBNSS_DISTDIR) \
 		DIST=$(@D)/$(LIBNSS_DISTDIR) \
 		CHECKLOC= \
 		$(LIBNSS_BUILD_VARS)
-	$(TARGET_CONFIGURE_OPTS) $(MAKE) -C $(@D)/nss lib/dbm all \
+	$(TARGET_CONFIGURE_OPTS) $(MAKE1) -C $(@D)/nss lib/dbm all \
 		SOURCE_MD_DIR=$(@D)/$(LIBNSS_DISTDIR) \
 		DIST=$(@D)/$(LIBNSS_DISTDIR) \
 		CHECKLOC= \
@@ -127,12 +127,12 @@ HOST_LIBNSS_BUILD_VARS += USE_64=1
 endif
 
 define HOST_LIBNSS_BUILD_CMDS
-	$(HOST_CONFIGURE_OPTS) $(MAKE) -C $(@D)/nss coreconf \
+	$(HOST_CONFIGURE_OPTS) $(MAKE1) -C $(@D)/nss coreconf \
 		SOURCE_MD_DIR=$(@D)/$(LIBNSS_DISTDIR) \
 		DIST=$(@D)/$(LIBNSS_DISTDIR) \
 		CHECKLOC= \
 		$(HOST_LIBNSS_BUILD_VARS)
-	$(HOST_CONFIGURE_OPTS) $(MAKE) -C $(@D)/nss lib/dbm all \
+	$(HOST_CONFIGURE_OPTS) $(MAKE1) -C $(@D)/nss lib/dbm all \
 		SOURCE_MD_DIR=$(@D)/$(LIBNSS_DISTDIR) \
 		DIST=$(@D)/$(LIBNSS_DISTDIR) \
 		CHECKLOC= \