Fix building issues in WIN32, remove unnecessary modification.

[kindred77]

Got some issues below when building on WIN10 with Microsoft Visual C++ 2017:

common/types/string_type.hpp:

error C2039: "min": is not a member of "std"

function/scalar/strftime_format.cpp

error C2039: "tolower": is not a member of "std"

function/scalar/compressed_materialization/compress_string.cpp

error C2219 syntax error : type qualifier must be after '*'
line 15 and line 21

Have removed the unnecessary modification from the prev one, see:
#11323

BTW, duckdb is awesome, thanks you all for sharing such great project.

[Mytherin]

Thanks - LGTM. I've just removed the #ifdef WIN32 as I think these changes are fine to apply in the general case.