configure fails to detect gdImageStringFT when iconv found

[kyngchaos]

If iconv is found and I know it's needed in GD, gdImageStringFT test fails. It looks like bad logic - it only tests if GD needs iconv if iconv is found and it's not GD 2.x:

if test "$IS_GD2" = "false" -a -n "$ICONV_LIB"; then

then it checks for GD + iconv, which is added to GD_XTRA_LIBS if it succeeds. If GD2 was found, it skips the GD + iconv test, then the later gdImageStringFT test fails.

I'm using GD 2.0.36rc1 static lib, with iconv and freetype 2.4 shared libs.