adb: win32: fix exec-in and exec-out to use binary mode

adb exec-in and exec-out are designed to read/write binary data
according to the commit description at:
https://android.googlesource.com/platform/system/core/+/5d9d434%5E!/



On Windows, when adb_read and adb_write are used, they are always in
binary mode (because sysdeps_win32.cpp calls Windows APIs direct). But
unix_read, unix_write, fread, fwrite, read, write use the text
translation mode of the C Runtime file descriptor, which is by default
textmode.

adb exec-in and exec-out use copy_to_file() which uses unix_read() and
fwrite() when reading/writing stdin and stdout, thus, copy_to_file()
should switch to binary mode for those cases (it already uses binary
mode for file descriptors other than stdin and stdout).

copy_to_file() is also called by adb backup, adb restore, and adb
install-multiple, but those do not use stdin or stdout, so those
codepaths should not be affected by this change.

Change-Id: I3446d9b363d20a2c2f6be2b96e55b653d99df2f9
Signed-off-by: Spencer Low <CompareAndSwap@gmail.com>