[source] build: actually fix the creation of PKG_INFO_DIR

[LEDE Commits]

jogo pushed a commit to source.git, branch master:
https://git.lede-project.org/22b5e285ab36ee0a0dae97d4f60dc77fc3943bee

commit 22b5e285ab36ee0a0dae97d4f60dc77fc3943bee
Author: Jonas Gorski <jonas.gorski at gmail.com>
AuthorDate: Sat Oct 28 11:57:39 2017 +0200

    build: actually fix the creation of PKG_INFO_DIR
    
    The creation was accidentally moved to the wrong hook, fix it by moving
    it to the pre hook.
    
    Fixes: e5e5c3f5fd38 ("build: ensure PKG_INFO_DIR exists before trying to use it")
    Signed-off-by: Jonas Gorski <jonas.gorski at gmail.com>
---
 include/kernel.mk | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/kernel.mk b/include/kernel.mk
index f2d2a12..d620fdc 100644
--- a/include/kernel.mk
+++ b/include/kernel.mk
@@ -126,6 +126,7 @@ endif
 PKG_EXTMOD_SUBDIRS ?= .
 
 define populate_module_symvers
+	@mkdir -p $(PKG_INFO_DIR)
 	cat /dev/null > $(PKG_INFO_DIR)/$(PKG_NAME).symvers; \
 	for subdir in $(PKG_EXTMOD_SUBDIRS); do \
 		cat $(PKG_INFO_DIR)/*.symvers 2>/dev/null > $(PKG_BUILD_DIR)/$$$$subdir/Module.symvers; \
@@ -133,7 +134,6 @@ define populate_module_symvers
 endef
 
 define collect_module_symvers
-	@mkdir -p $(PKG_INFO_DIR)
 	for subdir in $(PKG_EXTMOD_SUBDIRS); do \
 		grep -F $(PKG_BUILD_DIR) $(PKG_BUILD_DIR)/$$$$subdir/Module.symvers >> $(PKG_BUILD_DIR)/Module.symvers.tmp; \
 	done; \