lucihttp: update to latest HEAD

c7c9c66 src: extend multipart parser test program
5071efb testcases: add multipart parsing edge cases
689e3d0 lib: multipart-parser: fix various edge cases

Fixes #1754.
Signed-off-by: Jo-Philipp Wich <jo@mein.io>

contrib/package/lucihttp/Makefile

@@ -5,9 +5,9 @@ PKG_RELEASE:=1
 
 PKG_SOURCE_PROTO:=git
 PKG_SOURCE_URL=https://github.com/jow-/lucihttp.git
-PKG_SOURCE_DATE:=2018-04-18
-PKG_SOURCE_VERSION:=8617997c62c8ff4c5473c3ef4bad932033595cf5
-PKG_MIRROR_HASH:=bdf18413271d82f72747bc839a0765df3c4ab13f1ec05d7b265b323de40c7d97
+PKG_SOURCE_DATE:=2018-04-20
+PKG_SOURCE_VERSION:=689e3d0807bdab115e8b3a271799458a7fb84284
+PKG_MIRROR_HASH:=578ec63a4e7b27f42e2bed58ccbf47079230591835ef89ad84f1326bd53c9f37
 CMAKE_INSTALL:=1
 
 PKG_LICENSE:=ISC