Add GPU monitoring support #373

Job	Run time
static-build (aarch64-linux-musl)	1m 29s
static-build (aarch64_be-linux-musl)	1m 26s
static-build (arm-linux-musleabi)	1m 23s
static-build (arm-linux-musleabihf)	1m 17s
static-build (armeb-linux-musleabi)	1m 30s
static-build (armeb-linux-musleabihf)	1m 38s
static-build (armel-linux-musleabi)	1m 31s
static-build (armel-linux-musleabihf)	1m 20s
static-build (armv5l-linux-musleabi)	1m 27s
static-build (armv5l-linux-musleabihf)	1m 21s
static-build (armv6-linux-musleabi)	1m 18s
static-build (armv6-linux-musleabihf)	1m 30s
static-build (armv7l-linux-musleabihf)	1m 24s
static-build (armv7m-linux-musleabi)	1m 31s
static-build (armv7r-linux-musleabihf)	1m 20s
static-build (i486-linux-musl)	1m 14s
static-build (i686-linux-musl)	1m 21s
static-build (m68k-linux-musl)	1m 13s
static-build (mips-linux-musl)	1m 25s
static-build (mips-linux-musln32sf)	1m 31s
static-build (mips-linux-muslsf)	1m 28s
static-build (mips64-linux-musl)	1m 31s
static-build (mips64-linux-musln32)	1m 31s
static-build (mips64-linux-musln32sf)	1m 40s
static-build (mips64el-linux-musl)	1m 23s
static-build (mips64el-linux-musln32)	1m 29s
static-build (mips64el-linux-musln32sf)	1m 32s
static-build (mipsel-linux-musl)

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