[source] fstools: update to latest git HEAD

[LEDE Commits]

blogic pushed a commit to source.git, branch master:
https://git.lede-project.org/0c1420b3febf6b3391ba38f80f73586865dbece4

commit 0c1420b3febf6b3391ba38f80f73586865dbece4
Author: John Crispin <john at phrozen.org>
AuthorDate: Mon Jul 31 19:15:36 2017 +0200

    fstools: update to latest git HEAD
    
    8ab4fda fstools: add btrfs support
    
    Signed-off-by: John Crispin <john at phrozen.org>
---
 package/system/fstools/Makefile | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/package/system/fstools/Makefile b/package/system/fstools/Makefile
index 2769019..dd54d6b 100644
--- a/package/system/fstools/Makefile
+++ b/package/system/fstools/Makefile
@@ -12,9 +12,9 @@ PKG_RELEASE:=1
 
 PKG_SOURCE_PROTO:=git
 PKG_SOURCE_URL=$(LEDE_GIT)/project/fstools.git
-PKG_SOURCE_DATE:=2017-07-12
-PKG_SOURCE_VERSION:=0dfe61a86255b877dd67b2ba3479709ecf7632ae
-PKG_MIRROR_HASH:=9f6053aaedb2f53dcda934e910e8d039b6b3e16acd85462881e374bb9ffc5e25
+PKG_SOURCE_DATE:=2017-07-31
+PKG_SOURCE_VERSION:=8ab4fda66a136f5b0f1e5dff9d3649961ffc9158
+PKG_MIRROR_HASH:=f04712fbefbcc2af1da9364310ac6dd771322c3ce2d920d2c003aaea97dbe4b4
 CMAKE_INSTALL:=1
 
 PKG_LICENSE:=GPL-2.0