Remove "-fpermissive" compiler option from Linux CMake config

Summary: "-fpermissive", when used with GCC, allow some nonconforming code to compile.  And Clang does not implement the option.  Disabling as Ocean builds without it.

Reviewed By: enpe

Differential Revision: D59415762

fbshipit-source-id: e2db5bc12fc471ec547c8e2933afb189d2825dec

build/cmake/ocean_utilities.cmake

@@ -145,7 +145,6 @@ function(get_ocean_compiler_flags ocean_compiler_flags)
         list(APPEND local_compiler_flags "/D_UNICODE")
         list(APPEND local_compiler_flags "/DUNICODE")
     elseif (LINUX)
-        list(APPEND local_compiler_flags "-fpermissive")
         if (OCEAN_TARGET_PROCESSOR_TYPE STREQUAL "x86_64")
             list(APPEND local_compiler_flags "-msse4.1")
             list(APPEND local_compiler_flags "-mavx2")