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mkfile: use ar vr instead of ar vu

ar vu replaces only if the modification date has changed.  this is
problematic if you can build libc fast enough that the portable code
and architecture specific code end up with a close enough modification
time.

the portable files will not be replaced by the machine specific files,
which means code that uses locks will fail to link.

--- a/sys/src/cmd/cc/mkfile

+++ b/sys/src/cmd/cc/mkfile

@@ -37,7 +37,7 @@

 	date

 $LIB:	$LIBOBJ

-	ar vu $LIB $OFILES

+	ar vr $LIB $OFILES

 mac.$O: macbody

--- a/sys/src/cmd/ip/httpd/mkfile

+++ b/sys/src/cmd/ip/httpd/mkfile

@@ -53,7 +53,7 @@

 	sed 17q /tmp/search

 $LIBS:	$LIBSOFILES

-	ar vu $LIBS $newprereq

+	ar vr $LIBS $newprereq

 	rm $newprereq

 	# rm $newmember - cannot do this because of mk race

--- a/sys/src/cmd/mklib

+++ b/sys/src/cmd/mklib

@@ -9,7 +9,7 @@

 all:V:	$LIB

 $LIB:	$LIBOBJ

-	ar vu $LIB $newmember

+	ar vr $LIB $newmember

 %.$O:	$HFILES		# don't combine with following %.$O rules

--- a/sys/src/cmd/mksyslib

+++ b/sys/src/cmd/mksyslib

@@ -3,10 +3,10 @@

 all:V:	$LIB

 $LIB:V:	$OFILES			# force archive even when not needed

-	ar vu $LIB $newprereq

+	ar vr $LIB $newprereq

 &:n:	&.$O

-	ar vu $LIB $stem.$O

+	ar vr $LIB $stem.$O

 %.$O:	$HFILES			# don't combine with following %.$O rules

--- a/sys/src/libc/9syscall/mkfile

+++ b/sys/src/libc/9syscall/mkfile

@@ -148,7 +148,7 @@

 		}} > $i.s

 		$AS $i.s

 	}

-	ar vu /$objtype/lib/libc.a *.$O

+	ar vr /$objtype/lib/libc.a *.$O

 	rm -f *.$O *.s

 nuke clean:V:

--- a/sys/src/libc/port/mkfile

+++ b/sys/src/libc/port/mkfile

@@ -163,6 +163,6 @@

 $EXTRA:		$GEN

 extra:V:	$EXTRA

-	ar vu $LIB $prereq

+	ar vr $LIB $prereq

 regen:V:	$GEN

-- 

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