bat: fix build error where zlib.h was not found

packages/bat/build.sh

@@ -9,6 +9,10 @@ TERMUX_PKG_SRCURL=https://github.com/sharkdp/bat/archive/v$TERMUX_PKG_VERSION.ta
 TERMUX_PKG_DEPENDS="less, zlib"
 TERMUX_PKG_BUILD_IN_SRC=yes
 
+termux_step_pre_configure() {
+	CFLAGS="$CFLAGS $CPPFLAGS"
+}
+
 termux_step_post_make_install() {
 	mkdir -p $TERMUX_PREFIX/share/man/man1
 	cp $TERMUX_PKG_SRCDIR/doc/bat.1 $TERMUX_PREFIX/share/man/man1/