jhead: make sure our compiler flags are used

To fix compilation in ubuntu21 docker image.

Also patch installation step in makefile to avoid us having to
override termux_step_make_install.

packages/jhead/build.sh

@@ -3,11 +3,7 @@ TERMUX_PKG_DESCRIPTION="Exif Jpeg header manipulation tool"
 TERMUX_PKG_LICENSE="Public Domain"
 TERMUX_PKG_MAINTAINER="@termux"
 TERMUX_PKG_VERSION=3.04
+TERMUX_PKG_REVISION=1
 TERMUX_PKG_SRCURL=http://www.sentex.net/~mwandel/jhead/jhead-${TERMUX_PKG_VERSION}.tar.gz
 TERMUX_PKG_SHA256=ef89bbcf4f6c25ed88088cf242a47a6aedfff4f08cc7dc205bf3e2c0f10a03c9
 TERMUX_PKG_BUILD_IN_SRC=true
-
-termux_step_make_install() {
-	install -Dm700 jhead $TERMUX_PREFIX/bin/jhead
-	install -Dm600 jhead.1 $TERMUX_PREFIX/share/man/man1/jhead.1
-}

packages/jhead/makefile.patch

@@ -0,0 +1,23 @@
+--- ../makefile.orig	2022-02-04 07:15:35.023914372 +0000
++++ ./makefile	2022-02-04 07:16:53.153727804 +0000
+@@ -3,9 +3,9 @@
+ #--------------------------------
+ OBJ=.
+ SRC=.
+-CPPFLAGS:=$(shell dpkg-buildflags --get CPPFLAGS)
+-CFLAGS:=$(shell dpkg-buildflags --get CFLAGS)
+-LDFLAGS:=$(shell dpkg-buildflags --get LDFLAGS)
++CPPFLAGS?=$(shell dpkg-buildflags --get CPPFLAGS)
++CFLAGS?=$(shell dpkg-buildflags --get CFLAGS)
++LDFLAGS?=$(shell dpkg-buildflags --get LDFLAGS)
+ 
+ all: jhead
+ 
+@@ -22,4 +22,6 @@
+ 	rm -f $(objs) jhead
+ 
+ install:
+-	cp jhead ${DESTDIR}/usr/bin/
++	install -Dm700 jhead ${DESTDIR}$(PREFIX)/bin/
++	mkdir -p ${DESTDIR}$(PREFIX)/share/man/man1/
++	install -m600 jhead.1 ${DESTDIR}$(PREFIX)/share/man/man1/