tools: improve and simplify dosfstools

- use default host install and clean.
- backport compatibility patch for OS X and LEDE (avoids having to force iconv
for OS X).
- use default HOST_BUILD_DIR.

Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>

tools/dosfstools/Makefile

@@ -15,21 +15,10 @@ PKG_SOURCE_URL:=https://github.com/dosfstools/dosfstools/releases/download/v$(PK
 		http://fossies.org/linux/misc
 PKG_MD5SUM:=9037738953559d1efe04fc5408b6846216cc0138f7f9d32de80b6ec3c35e7daf
 
-HOST_BUILD_DIR:=$(BUILD_DIR_HOST)/$(PKG_NAME)-$(PKG_VERSION)
-
 include $(INCLUDE_DIR)/host-build.mk
 
 ifeq ($(HOST_OS),Darwin)
 HOST_CFLAGS += -UHAVE_ENDIAN_H
-LDLIBS += -liconv
 endif
 
-define Host/Install
-	$(INSTALL_BIN) $(HOST_BUILD_DIR)/src/mkfs.fat $(STAGING_DIR_HOST)/bin/
-endef
-
-define Host/Clean
-	rm -f $(STAGING_DIR_HOST)/bin/mk{dosfs,fs.fat}
-endef
-
 $(eval $(call HostBuild))

tools/dosfstools/patches/0002-Switch-to-AC_CHECK_LIB-for-iconv-library-linking.patch

@@ -0,0 +1,27 @@
+From 1c6c135ee15e449c1bf2e76d5307f83a3a1d7425 Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?=C3=81lvaro=20Fern=C3=A1ndez=20Rojas?= <noltari@gmail.com>
+Date: Tue, 11 Oct 2016 12:07:48 +0200
+Subject: [PATCH] Switch to AC_CHECK_LIB for iconv library linking.
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+AC_SEARCH_LIB doesn't work properly for openwrt/lede when building dosfstools
+as a package.
+
+Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
+---
+ configure.ac | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+--- a/configure.ac
++++ b/configure.ac
+@@ -59,7 +59,7 @@ if test "x$with_udev" != "xno"; then
+ 		  [true])
+ fi
+ 
+-AC_SEARCH_LIBS(iconv_open, iconv)
++AC_CHECK_LIB(iconv, iconv_open)
+ 
+ AC_CONFIG_FILES([Makefile src/Makefile src/version.h
+ 		 manpages/Makefile manpages/mkfs.fat.8