MFH: r406052

Fix build on FreeBSD 9.x

gdaldither.cpp: In function 'int FindNearestColor(int, int*, int, int, int)':
gdaldither.cpp:534: note: use -flax-vector-conversions to permit conversions
between vectors with differing element types or numbers of subparts
gdaldither.cpp:534: error: cannot convert 'int vector' to 'long long int
vector' for argument '1' to 'long long int vector
builtin_ia32_psrlqi128(long long int vector, int)'
gdaldither.cpp:539: error: cannot convert 'int vector' to 'long long int
vector' for argument '1' to 'long long int vector__
builtin_ia32_psrlqi128(long long int vector__, int)'
../GDALmake.opt:582: recipe for target 'gdaldither.o' failed
gmake[1]: *** [gdaldither.o] Error 1

PR: 205701
Submitted by: myself
Approved by: maintainer timeout
Approved by: ports-secteam (miwi)