Add SSE2_FLAGS and --disable-sse2 to configure.
Add SSE2_FLAGS and --disable-sse2 to configure.

This is required for YADIF assembler.

wideioltd/mlt,anba8005/mlt,xzhavilla/mlt,ttill/MLT,zzhhui/mlt,siddharudh/mlt,xzhavilla/mlt,wideioltd/mlt,mltframework/mlt,anba8005/mlt,xzhavilla/mlt,ttill/MLT-roto,mltframework/mlt,ttill/MLT-roto,j-b-m/mlt,wideioltd/mlt,j-b-m/mlt,j-b-m/mlt,xzhavilla/mlt,ttill/MLT-roto-tracking,zzhhui/mlt,siddharudh/mlt,mltframework/mlt,ttill/MLT-roto-tracking,xzhavilla/mlt,mltframework/mlt,gmarco/mlt-orig,ttill/MLT-roto,j-b-m/mlt,ttill/MLT-roto-tracking,ttill/MLT-roto,mltframework/mlt,mltframework/mlt,mltframework/mlt,anba8005/mlt,ttill/MLT,ttill/MLT,ttill/MLT,gmarco/mlt-orig,mltframework/mlt,ttill/MLT-roto-tracking,j-b-m/mlt,xzhavilla/mlt,gmarco/mlt-orig,anba8005/mlt,j-b-m/mlt,ttill/MLT-roto-tracking,j-b-m/mlt,j-b-m/mlt,anba8005/mlt,ttill/MLT-roto-tracking,anba8005/mlt,mltframework/mlt,ttill/MLT,siddharudh/mlt,ttill/MLT-roto,wideioltd/mlt,xzhavilla/mlt,ttill/MLT-roto,gmarco/mlt-orig,mltframework/mlt,j-b-m/mlt,zzhhui/mlt,anba8005/mlt,gmarco/mlt-orig,wideioltd/mlt,wideioltd/mlt,siddharudh/mlt,anba8005/mlt,siddharudh/mlt,ttill/MLT,gmarco/mlt-orig,ttill/MLT-roto-tracking,xzhavilla/mlt,ttill/MLT-roto,siddharudh/mlt,anba8005/mlt,ttill/MLT,ttill/MLT-roto-tracking,siddharudh/mlt,j-b-m/mlt,zzhhui/mlt,gmarco/mlt-orig,ttill/MLT-roto,gmarco/mlt-orig,ttill/MLT,wideioltd/mlt,wideioltd/mlt,zzhhui/mlt,wideioltd/mlt,xzhavilla/mlt,ttill/MLT,siddharudh/mlt,zzhhui/mlt,gmarco/mlt-orig,zzhhui/mlt,ttill/MLT-roto,zzhhui/mlt,zzhhui/mlt,siddharudh/mlt,ttill/MLT-roto-tracking