Add -skipfailures to the ogr2ogr -f convert command (#3690)

Make it work the example in Forum https://forum.generic-mapping-tools.org/t/shape-file-into-gmt/685/3?u=joaquim

Author: joa-quim

src/gmt_io.c

@@ -4703,7 +4703,7 @@ FILE * gmt_fopen (struct GMT_CTRL *GMT, const char *filename, const char *mode)
 						snprintf (GMT->current.io.tempfile, PATH_MAX, "gmt_ogr_%d.gmt", (int)getpid());
 					GMT_Report (GMT->parent, GMT_MSG_INFORMATION, "Convert %s to GMT/OGR file %s\n", c, GMT->current.io.tempfile);
 #if GDAL_VERSION_MAJOR >= 2
-					snprintf (cmd, GMT_BUFSIZ+GMT_LEN256, "ogr2ogr -mapFieldType Integer64=Integer -f \"OGR_GMT\" %s %s", GMT->current.io.tempfile, c);
+					snprintf (cmd, GMT_BUFSIZ+GMT_LEN256, "ogr2ogr -mapFieldType Integer64=Integer -skipfailures -f \"OGR_GMT\" %s %s", GMT->current.io.tempfile, c);
 #else
 					snprintf (cmd, GMT_BUFSIZ+GMT_LEN256, "ogr2ogr -f \"GMT\" %s %s", GMT->current.io.tempfile, c);
 #endif