[ELF] - Fix format specifiers in writeOutSecLine()

I had a error in map-file.s testcase under MSVS2015/win32:

map-file.s:30:16: error: expected string not found in input
// CHECK-NEXT: 0000000000200158 0000000000000030 8 .eh_frame

<stdin>:2:1: note: scanning from here
0000000000200158 10 30 .eh_frame

Format string '%0*x' requires an argument of type 'unsigned int',
but argument has type 'uint64_t'. Proper format is '%0*llx' then.

This fixes testcase failture for me.

llvm-svn: 292102