Make Windows versions of the pterm icons.

icons/Makefile will now rebuild them, but also, as per this code
base's usual policy with Windows icons, they're committed directly in
the windows subdir.

icons/Makefile

@@ -14,7 +14,7 @@ MONOPNGS = $(patsubst %.pam,%.png,$(MONOPAMS))
 TRUEPNGS = $(patsubst %.pam,%.png,$(TRUEPAMS))
 
 ICOS = putty.ico puttygen.ico pscp.ico pageant.ico pageants.ico puttycfg.ico \
-       puttyins.ico
+       puttyins.ico pterm.ico ptermcfg.ico
 ICNS = PuTTY.icns Pterm.icns
 CICONS = xpmputty.c xpmpucfg.c xpmpterm.c xpmptcfg.c
 
@@ -69,6 +69,14 @@ pscp.ico: pscp-16.png pscp-32.png pscp-48.png \
           pscp-16-mono.png pscp-32-mono.png pscp-48-mono.png
 	./icon.pl -4 $(filter-out %-mono.png, $^) -1 $(filter %-mono.png, $^) > $@
 
+pterm.ico: pterm-16.png pterm-32.png pterm-48.png \
+           pterm-16-mono.png pterm-32-mono.png pterm-48-mono.png
+	./icon.pl -4 $(filter-out %-mono.png, $^) -1 $(filter %-mono.png, $^) > $@
+
+ptermcfg.ico: ptermcfg-16.png ptermcfg-32.png ptermcfg-48.png \
+              ptermcfg-16-mono.png ptermcfg-32-mono.png ptermcfg-48-mono.png
+	./icon.pl -4 $(filter-out %-mono.png, $^) -1 $(filter %-mono.png, $^) > $@
+
 # Because the installer icon makes heavy use of brown when drawing
 # the cardboard box, it's worth having 8-bit versions of it in
 # addition to the 4- and 1-bit ones.