pragma->tail is described as "anything after the operation", but
existing parsing passed just the first whitespace-delimited
word. Change the parsing to just strip leading and trailing
white space off the rest of the line, but keep interior spaces
if there are any.
This is preparation for a build_version pragma for Mach-O matching
the llvm-as .build_version syntax.
Signed-off-by: Fabian Giesen <fabian.giesen@epicgames.com>
0ee113ce68