Augment, rather than replace, existing RUSTFLAGS when building #103
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Some complex environments may use RUSTFLAGS to control the behavior of rust compilation. Rather than overwriting RUSTFLAGS with custom flags, augment any existing RUSTFLAGS to preserve these environments.
This is used, for example, by Void Linux to set
--sysroot=${XBPS_CROSS_BASE}/usr
in cross-compilation environments to point to the target system root.