update to 6.4

Improvements:
- The file browser does not crash when moving up to the root folder.
- Softwrapping very long lines is done more efficiently.
- Invoking the formatter does not blink the screen.

ok naddy@

editors/nano/Makefile

@@ -1,6 +1,6 @@
 COMMENT=	simple editor, inspired by Pico
 
-DISTNAME=	nano-6.3
+DISTNAME=	nano-6.4
 CATEGORIES=	editors
 HOMEPAGE=	https://www.nano-editor.org/
 

editors/nano/distinfo

@@ -1,2 +1,2 @@
-SHA256 (nano-6.3.tar.xz) = 61MtpJhWcnMLUA9oXbqriFpGbQj7v3QVgyuVgF5vhoc=
-SIZE (nano-6.3.tar.xz) = 1581772
+SHA256 (nano-6.4.tar.xz) = QZmujKeKd5beVt4aQbgh3EeRLAMH6YFrVswxffNGYcA=
+SIZE (nano-6.4.tar.xz) = 1593804

editors/nano/patches/patch-src_Makefile_in

@@ -1,7 +1,7 @@
 Index: src/Makefile.in
 --- src/Makefile.in.orig
 +++ src/Makefile.in
-@@ -1683,7 +1683,7 @@ nano_SOURCES = \
+@@ -1685,7 +1685,7 @@ nano_SOURCES = \
  		utils.c \
  		winio.c
  
@@ -10,12 +10,12 @@ Index: src/Makefile.in
  		$(LIB_CLOCK_GETTIME) $(LIBTHREAD)
  
  all: all-am
-@@ -2056,7 +2056,7 @@ winio.o: revision.h
+@@ -2058,7 +2058,7 @@ winio.o: revision.h
  
  # Always run the commands in this rule.  But update the target
  # only when the revision actually changed.
 -revision.h: FORCE
 +revision.h:
  	@[ -f $@ ] || touch $@
- 	@echo "#define $(SOMETHING)" | cmp -s $@ - || \
- 			echo "#define $(SOMETHING)" > $@
+ 	@! git describe >/dev/null 2>&1 || \
+ 			echo "#define $(SOMETHING)" | cmp -s $@ - || \