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Description of problem: Error: Transaction check error: file /usr/libexec/getconf/default from install of gcc-5.3.1-4.fc24.i686 conflicts with file from package gcc-5.3.1-4.fc24.x86_64 lrwxrwxrwx. 1 root root 19 Jan 8 22:41 /usr/libexec/getconf/default -> POSIX_V6_LP64_OFF64
Only (selected) lib* subpackages of gcc are meant to be multilib, gcc* subpackages are not, you want them solely for the primary architecture. So, installing both gcc.i686 and gcc.x86_64 is a user error.