add c++ rules to mkfiles.

I unilateraly chose .C as
the extension of choice for c++.

-Steve

Notes:
Wed Mar 19 17:02:55 EDT 2008 geoff
    I'm going to sorry this for now.  If you eventually get a C++ compiler
    that you think is of real use, I'll reconsider it.


Reference: /n/sources/patch/sorry/cpp-rules
Date: Mon Nov 26 00:01:32 CET 2007
Signed-off-by: steve@quintile.net
Reviewed-by: geoff

--- /sys/src/cmd/mklib	Sun Nov 25 23:57:50 2007
+++ /sys/src/cmd/mklib	Sun Nov 25 23:57:47 2007
@@ -16,6 +16,9 @@
 %.$O:	%.c
 	$CC $CFLAGS $stem.c
 
+%.$O:	%.C
+	c++/$CC $CFLAGS $stem.C
+
 %.$O:	%.s
 	$AS $AFLAGS $stem.s
 
--- /sys/src/cmd/mkmany	Sun Nov 25 23:57:55 2007
+++ /sys/src/cmd/mkmany	Sun Nov 25 23:57:53 2007
@@ -16,6 +16,9 @@
 %.$O:	%.c
 	$CC $CFLAGS $stem.c
 
+%.$O:	%.C
+	c++/$CC $CFLAGS $stem.C
+
 %.$O:	%.s
 	$AS $AFLAGS $stem.s
 
--- /sys/src/cmd/mkone	Sun Nov 25 23:57:59 2007
+++ /sys/src/cmd/mkone	Sun Nov 25 23:57:57 2007
@@ -14,6 +14,9 @@
 %.$O:	%.c
 	$CC $CFLAGS $stem.c
 
+%.$O:	%.C
+	c++/$CC $CFLAGS $stem.C
+
 %.$O:	%.s
 	$AS $AFLAGS $stem.s
 
--- /sys/src/cmd/mksyslib	Sun Nov 25 23:58:03 2007
+++ /sys/src/cmd/mksyslib	Sun Nov 25 23:58:01 2007
@@ -13,6 +13,9 @@
 %.$O:	%.c
 	$CC $CFLAGS $stem.c
 
+%.$O:	%.C
+	c++/$CC $CFLAGS $stem.C
+
 %.$O:	%.s
 	$AS $AFLAGS $stem.s