Fix count member name resolution on gcc

A name resolution problem arises on gcc when defining the global function seqan::count()

seqan/core/include/seqan/bam_io/cigar.h: In function 'bool seqan::operator<(const seqan::CigarElement<TOperation, TCount>&, const seqan::CigarElement<TOperation, TCount>&)':
seqan/core/include/seqan/bam_io/cigar.h:160:96: error: '.' cannot appear in a constant-expression
seqan/core/include/seqan/bam_io/cigar.h:160:84: error: parse error in template argument list