issue #18: cross-build issue in util

Merged Thomas E. Dickey requested to merge dickey/libxt:issue-18-cross-build-util into master

Modify link rule for utils/makestrs to use $(CC_FOR_BUILD) directly, avoiding libtool flags added when cross-compiling the library.

Signed-off-by: Thomas E. Dickey dickey@invisible-island.net

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