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[as] Add section flags to myro object file

This is a first version and not all the flags can be written
to the output.

--- a/as/myro.c

+++ b/as/myro.c

@@ -46,6 +46,20 @@

 	return off;

 }

+static unsigned

+getsecflags(Section *sp)

+{

+	unsigned flags = MYROSEC_LOAD;

+

+	if (sp->flags & SREAD)

+		flags |= MYROSEC_READ;

+	if (sp->flags & SWRITE)

+		flags |= MYROSEC_WRITE;

+	if (sp->flags & SFILE)

+		flags |= MYROSEC_FILE;

+	return flags;

+}

+

 static size_t

 writesections(FILE *fp)

 {

@@ -55,7 +69,7 @@

 	for (sp = seclist; sp; sp = sp->next) {

 		sect.name = sp->name.offset;

-		sect.flags = 0;

+		sect.flags = getsecflags(sp);

 		sect.fill = sp->fill;

 		sect.aligment = sp->aligment;

 		sect.offset = off;

--- a/inc/myro.h

+++ b/inc/myro.h

@@ -44,6 +44,16 @@

 	unsigned long long offset;

 };

+enum myrosecflg {

+	MYROSEC_READ  = 1 << 0,

+	MYROSEC_WRITE = 1 << 1,

+	MYROSEC_EXEC  = 1 << 2,

+	MYROSEC_LOAD  = 1 << 3,

+	MYROSEC_FILE  = 1 << 4,

+	MYROSEC_ABS   = 1 << 5,

+	MYROSEC_BLOB  = 1 << 6,

+};

+

 extern int wrmyrohdr(FILE *fp, struct myrohdr *hdr);

 extern int wrmyrosec(FILE *fp, struct myrosect *sect);

 extern int wrmyrosym(FILE *fp, struct myrosym *sym);