.github/workflows/windows.yml: Build with APU_HAVE_ICONV=ON. #117

Job	Run time
Default	1m 54s
Default x86	2m 26s
Use Libxml2	2m 0s
Shared (no DSO)	2m 14s
Minimal	2m 16s
ODBC + SQLITE3 + PGSQL + CRYPTO + ICONV	6m 39s
LDAP	1m 30s
Static	1m 57s
	20m 56s

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