buildroot

libcpprestsdk: fix template whitespace-syntax

some files don't have a space inbetween the '<' and '::' charachters, which
will cause build failures on older toolchains. Adding a space inbetween these
two characters fixes the issue.

upstream-status: pending
https://github.com/Microsoft/cpprestsdk/pull/715

fixes:
http://autobuild.buildroot.net/results/797a9b5fdf6ab0f16f2249324b48292dfab61d9f
Signed-off-by: Adam Duskett <aduskett@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>