Maintainer: me
Compile tested: ar71xx, mips_34kc_gcc-5.3.0_musl, OpenWrt trunk 50104
                ar71xx, mips_24kc_gcc-5.4.0_musl, LEDE trunk r3503-a112435
Run tested: NONE

Description:
openwrt buildbot report build fail

```
./runConfigureICU CC="gcc" CFLAGS="-O2 -I/home/builder/trunk/openwrt/staging_dir/host/include -I/home/builder/trunk/openwrt/staging_dir/host/usr/include -I/home/builder/trunk/openwrt/staging_dir/target-i386_pentium4_glibc-2.22/host/include" CPPFLAGS="-I/home/builder/trunk/openwrt/staging_dir/host/include -I/home/builder/trunk/openwrt/staging_dir/host/usr/include -I/home/builder/trunk/openwrt/staging_dir/target-i386_pentium4_glibc-2.22/host/include" LDFLAGS="-L/home/builder/trunk/openwrt/staging_dir/host/lib -L/home/builder/trunk/openwrt/staging_dir/host/usr/lib -L/home/builder/trunk/openwrt/staging_dir/target-i386_pentium4_glibc-2.22/host/lib" SHELL="/usr/bin/env bash" Linux/gcc CC="gcc" CXX="g++" --disable-debug --enable-release --enable-shared --enable-static --enable-draft --enable-renaming --disable-tracing --disable-extras --enable-dyload --prefix=/home/builder/trunk/openwrt/staging_dir/target-i386_pentium4_glibc-2.22/host ; fi )
runConfigureICU: unrecognized platform "CC=gcc" (use --help for help)
```

"host-build.mk" is differs between OpenWrt and LEDE.

https://github.com/openwrt/packages/pull/3993

83b6bfc235

Signed-off-by: Hirokazu MORIKAWA <morikw2@gmail.com>

Maintainer: me
Compile tested: brcm2708 ,aarch64_cortex-a53+neon-vfpv4_musl, LEDE head r3426-4c09f99
Run tested: NONE

Description:
buildbots fail situation of CONFIG_CCACHE=y

`Running ./configure  CC=ccache gcc CXX=ccache g++ ....`

Signed-off-by: Hirokazu MORIKAWA <morikw2@gmail.com>

Maintainer: me
Compile tested: brcm2708
                aarch64_cortex-a53+neon-vfpv4_musl
                LEDE head r3426-4c09f99
Run tested: NONE

Description:
buildbots fail on link ARM object.

   error: xxxxxx.o uses VFP register arguments,

Signed-off-by: Hirokazu MORIKAWA <morikw2@gmail.com>

Maintainer: me
Compile tested: ar71xx mips_24kc_musl LEDE r3346-9eacb9d
Run tested: NONE

Description:
buildbots fail at accessing files under HOST_BUILD_DIR.

http://downloads.lede-project.org/snapshots/faillogs/mips_24kc/packages/icu/compile.txt

Move necessary files to STAGING_DIR_HOSTPKG.

Signed-off-by: Hirokazu MORIKAWA <morikw2@gmail.com>

Maintainer: @nxhack
Compile tested: ar71xx mips_24kc_musl-1.1.15 LEDE r2610-324bdf3
Run tested: NONE

Description:
icu: Bumped to v58.2
for emoji handling

previous PR #2817

add patches/001-disable-strtod_l.patch
missing xlocale.h in case of using musl.

Signed-off-by: Hirokazu MORIKAWA <morikw2@gmail.com>

Signed-off-by: Mirko Vogt <mirko@openwrt.org>