fix: build updater with static runtime to prevent flutter engine build linking errors

[bryanoltman]

We currently do this for patch. Without this flag, the updater failed to link into the Flutter engine with the following:

...
b"LINK : warning LNK4217: symbol 'qsort' defined in 'libucrt.lib(qsort.obj)' is imported by 'updater.lib(cover.o)' in function 'COVER_ctx_init'\r\n"
b'updater.lib(std-b84ff5acd6bc244a.std.bacbcc9a321ad2c6-cgu.0.rcgu.o) : error LNK2019: unresolved external symbol __imp_GetUserProfileDirectoryW referenced in function _ZN3std3env8home_dir17h0161835f45803d72E\r\n'
b'updater.lib(zdict.o) : error LNK2019: unresolved external symbol __imp_clock referenced in function ZDICT_clockSpan\r\n'
b'updater.lib(fastcover.o) : error LNK2001: unresolved external symbol __imp_clock\r\n'
b'updater.lib(cover.o) : error LNK2001: unresolved external symbol __imp_clock\r\n'
b'updater.lib(divsufsort.o) : error LNK2019: unresolved external symbol __imp__wassert referenced in function construct_BWT\r\n'
b'.\\flutter_windows.dll : fatal error LNK1120: 3 unresolved externals\r\n'
ninja: build stopped: subcommand failed.

[codecov]

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