[source] fstools: update to latest git HEAD

[LEDE Commits]

blogic pushed a commit to source.git, branch master:
https://git.lede-project.org/4f5776932b89a371ab768bebecc24c0f013baf45

commit 4f5776932b89a371ab768bebecc24c0f013baf45
Author: John Crispin <john at phrozen.org>
AuthorDate: Wed Mar 29 09:18:13 2017 +0200

    fstools: update to latest git HEAD
    
    20c16fc cmake: Make blockd link against libjson-c
    92b4c2c libfstools: add basic documentation of mount functions
    
    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 8d8d3dc..759ea65 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:=2017-03-06
-PKG_SOURCE_VERSION:=98bbb5a068d6d32ef0ba7db5647a59fc67dfe75b
-PKG_MIRROR_HASH:=1e832d8aa1ce3560ed49d12f46ed17251e6f9b80e3a40408f4b048c308acde84
+PKG_SOURCE_DATE:=2017-03-29
+PKG_SOURCE_VERSION:=20c16fc5fec00fdae547f083a822a7f1bd67d143
+PKG_MIRROR_HASH:=fc6402291119744843b8482d3f02d5e819b92afe52f261fa30ed8bd26f4a62f1
 CMAKE_INSTALL:=1
 
 PKG_LICENSE:=GPL-2.0