sendmail: fix confLIBSEARCHPATH to $(STAGING_DIR)

This fix issue 'cannot find -lnsl' on build server which has libnsl.so in
/usr/lib

Signed-off-by: Guo Li <uxgood.org@gmail.com>

mail/sendmail/Makefile

@@ -8,7 +8,7 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=sendmail
 PKG_VERSION:=8.15.2
-PKG_RELEASE:=1
+PKG_RELEASE:=2
 
 PKG_SOURCE:=$(PKG_NAME).$(PKG_VERSION).tar.gz
 PKG_SOURCE_URL:=http://artfiles.org/sendmail.org/pub/sendmail/ \
@@ -102,6 +102,7 @@ define Build/Prepare
 	$(CP) $(PKG_BUILD_DIR)/cf/cf/generic-linux.mc $(PKG_BUILD_DIR)/cf/cf/sendmail.mc
 	$(SED) 's@TARGET_CC@$(TARGET_CC)@g' $(PKG_BUILD_DIR)/devtools/Site/$(SITECONFIG)
 	$(SED) 's@TARGET_CFLAGS@$(TARGET_CFLAGS)@g' $(PKG_BUILD_DIR)/devtools/Site/$(SITECONFIG)
+	$(SED) 's@STAGING_DIR@$(STAGING_DIR)@g' $(PKG_BUILD_DIR)/devtools/OS/$(TARGET_OS)
 endef
 
 define Build/Compile

mail/sendmail/files/OpenWrt

@@ -7,7 +7,8 @@ define(`confSM_OS_HEADER', `sm_os_linux')
 define(`confLIBS', `-ldl')
 define(`confEBINDIR', `/usr/sbin')
 define(`confMKDIR', `mkdir')
-APPENDDEF(`confLIBSEARCH', `crypt nsl')
+define(`confLIBSEARCHPATH', `STAGING_DIR/lib STAGING_DIR/usr/lib')
+APPENDDEF(`confLIBSEARCH', `crypt')
 
 define(`confMTCCOPTS', `-D_REENTRANT')
 define(`confMTLDOPTS', `-lpthread')