Fix UNIX compile options

I removed the `graphqlpeg` library as a separate target, but I still had compile options set for it on UNIX.

Author: wravery

CMakeLists.txt

@@ -36,7 +36,6 @@ target_include_directories(graphqlservice SYSTEM INTERFACE $<INSTALL_INTERFACE:i
 target_include_directories(graphqlservice PRIVATE ${CMAKE_SOURCE_DIR} ${CMAKE_BINARY_DIR})
 
 if(UNIX)
-  target_compile_options(graphqlpeg PRIVATE -std=c++11)
   target_compile_options(graphqlservice PRIVATE -std=c++11)
   target_compile_options(schemagen PRIVATE -std=c++11)
 endif()