[FS#3982] Need rename "fallthrough" in libubox/utils.h to something other

[OpenWrt Bugs]

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A new Flyspray task has been opened.  Details are below. 

User who did this - Kirill Zhumarin (Azq2) 

Attached to Project - OpenWrt/LEDE Project
Summary - Need rename "fallthrough" in libubox/utils.h to something other
Task Type - Bug Report
Category - Packages
Status - Unconfirmed
Assigned To - 
Operating System - All
Severity - Medium
Priority - Very Low
Reported Version - Trunk
Due in Version - Undecided
Due Date - Undecided
Details - This define: https://lxr.openwrt.org/source/libubox/utils.h#L236
Conflicts with package "nlohmannjson"

Example:
In file included from Json.h:2,
                 from Ubus.h:11,
                 from ModemService.h:6,
                 from ModemService.cpp:1:
/openwrt/staging_dir/target-mipsel_24kc_musl/usr/include/nlohmann/json.hpp:1689:42: error: missing ')' after "__has_attribute"
     JSON_HEDLEY_HAS_ATTRIBUTE(fallthrough) || \
                                          ^
/openwrt/staging_dir/target-mipsel_24kc_musl/usr/include/nlohmann/json.hpp:1689:31: error: missing binary operator before token "("
     JSON_HEDLEY_HAS_ATTRIBUTE(fallthrough) || \
                               ^~~~~~~~~~~
/openwrt/staging_dir/target-mipsel_24kc_musl/usr/include/nlohmann/json.hpp:1692:57: error: missing ')' after "__has_attribute"
 #elif JSON_HEDLEY_HAS_CPP_ATTRIBUTE_NS(clang,fallthrough)
                                                         ^
/openwrt/staging_dir/target-mipsel_24kc_musl/usr/include/nlohmann/json.hpp:1692:46: error: missing binary operator before token "("
 #elif JSON_HEDLEY_HAS_CPP_ATTRIBUTE_NS(clang,fallthrough)
                                              ^~~~~~~~~~~
/openwrt/staging_dir/target-mipsel_24kc_musl/usr/include/nlohmann/json.hpp:1694:48: error: missing ')' after "__has_attribute"
 #elif JSON_HEDLEY_HAS_CPP_ATTRIBUTE(fallthrough)
                                                ^
/openwrt/staging_dir/target-mipsel_24kc_musl/usr/include/nlohmann/json.hpp:1694:37: error: missing binary operator before token "("
 #elif JSON_HEDLEY_HAS_CPP_ATTRIBUTE(fallthrough)


More information can be found at the following URL:
https://bugs.openwrt.org/index.php?do=details&task_id=3982

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