chore(main/jhead): modify Makefile patch to respect DESTDIR

So that we can install straight into TERMUX_PKG_MASSAGEDIR.

packages/jhead/makefile.patch

@@ -1,17 +1,19 @@
-diff --git a/makefile b/makefile
-index eb71bba..b96b2ba 100644
---- a/makefile
-+++ b/makefile
-@@ -1,7 +1,7 @@
+--- ../jhead-3.08/makefile	2023-06-06 16:08:43.000000000 +0000
++++ ./makefile	2023-07-14 09:38:54.030296111 +0000
+@@ -1,17 +1,17 @@
  #--------------------------------
  # jhead makefile for Unix
  #--------------------------------
 -PREFIX=$(DESTDIR)/usr/local
-+PREFIX?=$(DESTDIR)/usr/local
- BINDIR=$(PREFIX)/bin
- DOCDIR=$(PREFIX)/share/doc/jhead
- MANDIR=$(PREFIX)/share/man/man1
-@@ -10,8 +10,8 @@ SRC=.
+-BINDIR=$(PREFIX)/bin
+-DOCDIR=$(PREFIX)/share/doc/jhead
+-MANDIR=$(PREFIX)/share/man/man1
++PREFIX?=/usr/local
++BINDIR=$(DESTDIR)$(PREFIX)/bin
++DOCDIR=$(DESTDIR)$(PREFIX)/share/doc/jhead
++MANDIR=$(DESTDIR)$(PREFIX)/share/man/man1
+ OBJ=obj
+ SRC=.
  
  DPKG_BUILDFLAGS := $(shell command -v dpkg-buildflags 2> /dev/null)
  ifdef DPKG_BUILDFLAGS