sdl_net: fix install options for target and staging

This patch install with install-strip to the target and uses the default for
installing to staging. Makes the makefile even more compact, and also more
correct with using install-strip to get proper stripping of the installed
library.

Signed-off-by: Hans-Christian Egtvedt <hans-christian.egtvedt@atmel.com>

package/sdl_net/sdl_net.mk

@@ -11,9 +11,7 @@ SDL_NET_CONF_OPT = --localstatedir=/var \
 		--with-sdl-exec-prefix=$(STAGING_DIR)/usr
 
 SDL_NET_INSTALL_STAGING = YES
-SDL_NET_INSTALL_STAGING_OPT = DESTDIR=$(STAGING_DIR) install
-
-SDL_NET_INSTALL_TARGET_OPT = DESTDIR=$(TARGET_DIR) install
+SDL_NET_INSTALL_TARGET_OPT = DESTDIR=$(TARGET_DIR) install-strip
 
 SDL_NET_DEPENDENCIES = sdl