FR: allow multple include paths and -I short option

[GitMensch]

currently there is only "none" or "exactly one":

Open-COBOL-ESQL/ocesql/ppout.c

Lines 1967 to 1973 in eec3a23

	if(include_path){
	com_sprintf(filename,sizeof(filename), "%s/", include_path);
	}
	com_strcat(filename,sizeof(filename), l->incfileName);
	incf = fopen_or_die(filename, "r");

Open-COBOL-ESQL/ocesql/ocesql.c

Lines 360 to 365 in eec3a23

	if(strcmp("inc", opthead) == 0){
	if(optval != NULL){
	include_path = com_strdup(optval);
	} else {
	printf("invalid option: --inc is get directory path parameter.\n");
	}

(side note: if specified multiple times then each tie there is memory allocated, but it is never freed, nor an error displayed that --inc may be only used once)

FR: allow to use -I as alias for --inc and allow to specify multiple ones.