cgi-io: cmake: fix libraries lookup

In order to make it compile properly in more environments.

Signed-off-by: Petr Štetiar <ynezz@true.cz>

net/cgi-io/src/CMakeLists.txt

@@ -5,6 +5,8 @@ PROJECT(cgi-io C)
 INCLUDE(CheckFunctionExists)
 
 FIND_PATH(ubus_include_dir libubus.h)
+FIND_LIBRARY(ubox NAMES ubox)
+FIND_LIBRARY(ubus NAMES ubus)
 INCLUDE_DIRECTORIES(${ubus_include_dir})
 
 ADD_DEFINITIONS(-Os -Wall -Werror --std=gnu99 -g3 -Wmissing-declarations)
@@ -17,6 +19,6 @@ IF(APPLE)
 ENDIF()
 
 ADD_EXECUTABLE(cgi-io main.c multipart_parser.c)
-TARGET_LINK_LIBRARIES(cgi-io ubox ubus)
+TARGET_LINK_LIBRARIES(cgi-io ${ubox} ${ubus})
 
 INSTALL(TARGETS cgi-io RUNTIME DESTINATION sbin)