slang: fix static link with readline

slang forgets to link with ncurses that is a dependency of readline when
linking the slsh binary. Correct this.

While at it, also make sure to use staging ncurses5-config script and not the
host one. slang uses ncurses5-config to find terminfo location, and only
staging ncurses5-config provides the correct run-time location.

Fixes:
http://autobuild.buildroot.net/results/1dc/1dc52048254c32a24070fef1c1039cebb32e7ac1/
http://autobuild.buildroot.net/results/c17/c176511cbb147c2d8cb0ec0ff3c1612ce8971cb8/
http://autobuild.buildroot.net/results/78d/78dc2ba07b1d7f888aab94e223f3e0b1a1df3af5/

Signed-off-by: Baruch Siach <[email protected]>
Signed-off-by: Peter Korsgaard <[email protected]>

Author: baruchsiach

package/slang/slang.mk

@@ -40,13 +40,17 @@ endif
 
 ifeq ($(BR2_PACKAGE_NCURSES),y)
 SLANG_DEPENDENCIES += ncurses
+SLANG_CONF_ENV += ac_cv_path_nc5config=$(STAGING_DIR)/usr/bin/ncurses5-config
 else
 SLANG_CONF_OPTS += ac_cv_path_nc5config=no
 endif
 
 ifeq ($(BR2_PACKAGE_READLINE),y)
 SLANG_CONF_OPTS += --with-readline=gnu
 SLANG_DEPENDENCIES += readline
+ifeq ($(BR2_STATIC_LIBS),y)
+SLANG_CONF_ENV += LIBS="`$(STAGING_DIR)/usr/bin/ncurses5-config --libs`"
+endif
 endif
 
 ifeq ($(BR2_STATIC_LIBS),y)