librtlsdr: disable shared library target in build

Disable shared library target if BUILD_SHARED_LIBS if OFF.

Signed-off-by: Yuvaraj Patil <yuvaraj.patil@wipro.com>
---
diff -Nurp librtlsdr-v0.5.3_orig/src/CMakeLists.txt librtlsdr-v0.5.3/src/CMakeLists.txt
--- librtlsdr-v0.5.3_orig/src/CMakeLists.txt	2014-09-24 17:31:40.610337074 +0530
+++ librtlsdr-v0.5.3/src/CMakeLists.txt	2014-09-24 17:32:38.838334632 +0530
@@ -20,6 +20,7 @@
 ########################################################################
 # Setup library
 ########################################################################
+if(BUILD_SHARED_LIBS)
 add_library(rtlsdr_shared SHARED
     librtlsdr.c
     tuner_e4k.c
@@ -37,6 +38,7 @@ set_target_properties(rtlsdr_shared PROP
 set_target_properties(rtlsdr_shared PROPERTIES OUTPUT_NAME rtlsdr)
 set_target_properties(rtlsdr_shared PROPERTIES SOVERSION ${MAJOR_VERSION})
 set_target_properties(rtlsdr_shared PROPERTIES VERSION ${LIBVER})
+endif()
 
 add_library(rtlsdr_static STATIC
     librtlsdr.c
@@ -71,6 +73,12 @@ if(NOT WIN32)
 set_target_properties(rtlsdr_static PROPERTIES OUTPUT_NAME rtlsdr)
 endif()
 
+if(BUILD_SHARED_LIBS)
+set(rtlsdr_lib rtlsdr_shared)
+else()
+set(rtlsdr_lib rtlsdr_static)
+endif()
+
 ########################################################################
 # Build utility
 ########################################################################
@@ -81,33 +89,33 @@ add_executable(rtl_fm rtl_fm.c)
 add_executable(rtl_eeprom rtl_eeprom.c)
 add_executable(rtl_adsb rtl_adsb.c)
 add_executable(rtl_power rtl_power.c)
-set(INSTALL_TARGETS rtlsdr_shared rtlsdr_static rtl_sdr rtl_tcp rtl_test rtl_fm rtl_eeprom rtl_adsb rtl_power)
+set(INSTALL_TARGETS ${rtlsdr_lib} rtl_sdr rtl_tcp rtl_test rtl_fm rtl_eeprom rtl_adsb rtl_power)
 
-target_link_libraries(rtl_sdr rtlsdr_shared convenience_static
+target_link_libraries(rtl_sdr ${rtlsdr_lib} convenience_static
     ${LIBUSB_LIBRARIES}
     ${CMAKE_THREAD_LIBS_INIT}
 )
-target_link_libraries(rtl_tcp rtlsdr_shared convenience_static
+target_link_libraries(rtl_tcp ${rtlsdr_lib} convenience_static
     ${LIBUSB_LIBRARIES}
     ${CMAKE_THREAD_LIBS_INIT}
 )
-target_link_libraries(rtl_test rtlsdr_shared convenience_static
+target_link_libraries(rtl_test ${rtlsdr_lib} convenience_static
     ${LIBUSB_LIBRARIES}
     ${CMAKE_THREAD_LIBS_INIT}
 )
-target_link_libraries(rtl_fm rtlsdr_shared convenience_static
+target_link_libraries(rtl_fm ${rtlsdr_lib} convenience_static
     ${LIBUSB_LIBRARIES}
     ${CMAKE_THREAD_LIBS_INIT}
 )
-target_link_libraries(rtl_eeprom rtlsdr_shared convenience_static
+target_link_libraries(rtl_eeprom ${rtlsdr_lib} convenience_static
     ${LIBUSB_LIBRARIES}
     ${CMAKE_THREAD_LIBS_INIT}
 )
-target_link_libraries(rtl_adsb rtlsdr_shared convenience_static
+target_link_libraries(rtl_adsb ${rtlsdr_lib} convenience_static
     ${LIBUSB_LIBRARIES}
     ${CMAKE_THREAD_LIBS_INIT}
 )
-target_link_libraries(rtl_power rtlsdr_shared convenience_static
+target_link_libraries(rtl_power ${rtlsdr_lib} convenience_static
     ${LIBUSB_LIBRARIES}
     ${CMAKE_THREAD_LIBS_INIT}
 )