cmake : make libwhisper.so position independent (openai#1792)

This is similar to how libllama.so is built.

Signed-off-by: Tom Rix <[email protected]>

CMakeLists.txt

@@ -505,6 +505,7 @@ else()
 endif()
 
 if (BUILD_SHARED_LIBS)
+    set_target_properties(${TARGET} PROPERTIES POSITION_INDEPENDENT_CODE ON)
     target_link_libraries(${TARGET} PUBLIC
         ${CMAKE_DL_LIBS}
         )