Fix iodbc path on macos GH action #454

Job	Run time
windows (enable-iconv, enable-glib)	4m 31s
windows (enable-iconv, disable-glib)	4m 8s
windows (disable-iconv, enable-glib)	4m 1s
windows (disable-iconv, disable-glib)	5m 59s
macos (clang, enable-iconv, enable-glib)	1m 37s
macos (clang, enable-iconv, disable-glib)	1m 36s
macos (clang, disable-iconv, enable-glib)	1m 37s
macos (clang, disable-iconv, disable-glib)	1m 27s
macos (gcc, enable-iconv, enable-glib)	1m 45s
macos (gcc, enable-iconv, disable-glib)	1m 34s
macos (gcc, disable-iconv, enable-glib)	1m 34s
macos (gcc, disable-iconv, disable-glib)	1m 35s
macos-iodbc (clang, enable-glib)	4m 5s
macos-iodbc (clang, disable-glib)	1m 32s
macos-iodbc (gcc, enable-glib)	1m 41s
macos-iodbc (gcc, disable-glib)	1m 40s
linux (clang, enable-iconv, enable-glib)	1m 5s
linux (clang, enable-iconv, disable-glib)	1m 20s
linux (clang, disable-iconv, enable-glib)	1m 18s
linux (clang, disable-iconv, disable-glib)	1m 8s
linux (gcc, enable-iconv, enable-glib)	1m 11s
linux (gcc, enable-iconv, disable-glib)	41s
linux (gcc, disable-iconv, enable-glib)	1m 2s
linux (gcc, disable-iconv, disable-glib)	46s
linux (gcc-9, enable-iconv, enable-glib)	1m 50s
linux (gcc-9, enable-iconv, disable-glib)	1m 9s
linux (gcc-9, disable-iconv, enable-glib)	1m 31s
linux (gcc-9, disable-iconv, disable-glib)	41s
linux (gcc-10, enable-iconv, enable-glib)	1m 34s
linux (gcc-10, enable-iconv, disable-glib)	46s
linux (gcc-10, disable-iconv, enable-glib)	1m 37s
linux (gcc-10, disable-iconv, disable-glib)	48s
	58m 49s

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