netbsd: 8.0 -> 9.1

Notes:

- compat: Needs a header from common merged with it's wrapper.

- librt: Needs the jemalloc sources.

- libc: install libc_pic.a

  This was the behaviour on NetBSD 8.0, and ld.elf_so (in its current
  configuration) requires it.  We could also have disabled PIC in
  ld.elf_so.

- sys: fix build

  We use a more recent version of binutils than NetBSD 9.1 does, so we
  need to backport a patch from CURRENT.

Co-authored-by: John Ericson <John.Ericson@Obsidian.Systems>

pkgs/os-specific/bsd/netbsd/no-dynamic-linker.patch

@@ -0,0 +1,16 @@
+===================================================================
+RCS file: /ftp/cvs/cvsroot/src/sys/arch/i386/stand/efiboot/Makefile.efiboot,v
+rcsdiff: /ftp/cvs/cvsroot/src/sys/arch/i386/stand/efiboot/Makefile.efiboot,v: warning: Unknown phrases like `commitid ...;' are present.
+retrieving revision 1.16
+retrieving revision 1.17
+diff -u -p -r1.16 -r1.17
+--- sys/arch/i386/stand/efiboot/Makefile.efiboot	2019/09/13 02:19:45	1.16
++++ sys/arch/i386/stand/efiboot/Makefile.efiboot	2020/04/04 15:30:46	1.17
+@@ -41,6 +41,7 @@ BINMODE=444
+ .PATH:	${.CURDIR}/../../libsa
+ 
+ LDSCRIPT?= ${.CURDIR}/ldscript
++LDFLAGS+= --no-dynamic-linker --noinhibit-exec
+ LDFLAGS+= -nostdlib -T${LDSCRIPT} -Bsymbolic -shared -nocombreloc
+ CPPFLAGS+= -I$S -I${.CURDIR} -I${.CURDIR}/.. -I$S/lib/libsa
+ CPPFLAGS+= -I${.OBJDIR}