test: Attempt to fix nightly-linux
test: Attempt to fix nightly-linux

The nightly builds on linux have been failing over the past few days due to a
malformed LD_LIBRARY_PATH. It appears that the underlying cause is that one of
the tests, dep-info-custom, recursively invokes make but the RUSTC variable
passed down has the string "$LD_LIBRARY_PATH". This is intended to read the
host's original LD_LIBRARY_PATH, but it appears that the makefile is eagerly
expanding the "$L" to nothing, causing the original host's LD_LIBRARY_PATH to be
ignored.

This fix removes passing the string "$LD_LIBRARY_PATH" and rather expands it
eagerly to ensure that escaping doesn't happen at a later stage. I'm still not
entirely sure why the makefile is interpreting the dollar as a variable, but
this seems to fix the issue.

zachwick/rust,rprichard/rust,sae-bom/rust,omasanori/rust,ebfull/rust,robertg/rust,sae-bom/rust,zachwick/rust,jroesch/rust,avdi/rust,jashank/rust,barosl/rust,defuz/rust,zaeleus/rust,nham/rust,robertg/rust,victorvde/rust,jashank/rust,vhbit/rust,gifnksm/rust,jbclements/rust,untitaker/rust,pshc/rust,P1start/rust,zaeleus/rust,aneeshusa/rust,bombless/rust,kwantam/rust,pczarn/rust,andars/rust,TheNeikos/rust,mihneadb/rust,GBGamer/rust,jroesch/rust,pshc/rust,l0kod/rust,AerialX/rust,barosl/rust,mihneadb/rust,robertg/rust,0x73/rust,nwin/rust,mihneadb/rust,victorvde/rust,XMPPwocky/rust,pshc/rust,richo/rust,bombless/rust,bombless/rust,aidancully/rust,barosl/rust,gifnksm/rust,cllns/rust,avdi/rust,quornian/rust,ruud-v-a/rust,jbclements/rust,hauleth/rust,quornian/rust,zachwick/rust,GBGamer/rust,defuz/rust,dwillmer/rust,XMPPwocky/rust,rprichard/rust,emk/rust,philyoon/rust,AerialX/rust,barosl/rust,emk/rust,jbclements/rust,zachwick/rust,nwin/rust,TheNeikos/rust,mahkoh/rust,zubron/rust,AerialX/rust-rt-minimal,seanrivera/rust,omasanori/rust,mihneadb/rust,rohitjoshi/rust,cllns/rust,AerialX/rust-rt-minimal,reem/rust,erickt/rust,sae-bom/rust,cllns/rust,emk/rust,pczarn/rust,untitaker/rust,vhbit/rust,jashank/rust,P1start/rust,vhbit/rust,rohitjoshi/rust,pshc/rust,quornian/rust,reem/rust,l0kod/rust,defuz/rust,dwillmer/rust,l0kod/rust,miniupnp/rust,pshc/rust,ejjeong/rust,stepancheg/rust-ide-rust,mdinger/rust,0x73/rust,KokaKiwi/rust,ktossell/rust,nham/rust,quornian/rust,GBGamer/rust,miniupnp/rust,nwin/rust,aepsil0n/rust,philyoon/rust,XMPPwocky/rust,graydon/rust,mahkoh/rust,barosl/rust,graydon/rust,kwantam/rust,dinfuehr/rust,seanrivera/rust,richo/rust,KokaKiwi/rust,nwin/rust,graydon/rust,kwantam/rust,richo/rust,untitaker/rust,miniupnp/rust,ktossell/rust,gifnksm/rust,cllns/rust,rprichard/rust,untitaker/rust,nham/rust,GBGamer/rust,quornian/rust,carols10cents/rust,carols10cents/rust,P1start/rust,zubron/rust,krzysz00/rust,P1start/rust,l0kod/rust,jbclements/rust,stepancheg/rust-ide-rust,graydon/rust,dinfuehr/rust,krzysz00/rust,miniupnp/rust,miniupnp/rust,zubron/rust,vhbit/rust,mdinger/rust,richo/rust,dinfuehr/rust,jashank/rust,zubron/rust,l0kod/rust,aepsil0n/rust,stepancheg/rust-ide-rust,defuz/rust,untitaker/rust,vhbit/rust,reem/rust,mdinger/rust,vhbit/rust,mahkoh/rust,quornian/rust,P1start/rust,ejjeong/rust,ruud-v-a/rust,philyoon/rust,stepancheg/rust-ide-rust,AerialX/rust,rohitjoshi/rust,zachwick/rust,0x73/rust,jbclements/rust,rprichard/rust,l0kod/rust,jashank/rust,rprichard/rust,XMPPwocky/rust,avdi/rust,zubron/rust,avdi/rust,stepancheg/rust-ide-rust,emk/rust,pczarn/rust,aidancully/rust,kwantam/rust,dwillmer/rust,KokaKiwi/rust,reem/rust,vhbit/rust,mvdnes/rust,kimroen/rust,pczarn/rust,seanrivera/rust,miniupnp/rust,nham/rust,jbclements/rust,sae-bom/rust,nwin/rust,AerialX/rust-rt-minimal,omasanori/rust,stepancheg/rust-ide-rust,richo/rust,hauleth/rust,pelmers/rust,jashank/rust,sae-bom/rust,erickt/rust,KokaKiwi/rust,dwillmer/rust,reem/rust,emk/rust,l0kod/rust,kimroen/rust,victorvde/rust,richo/rust,seanrivera/rust,zaeleus/rust,zaeleus/rust,erickt/rust,aidancully/rust,hauleth/rust,pshc/rust,ktossell/rust,defuz/rust,kimroen/rust,TheNeikos/rust,andars/rust,untitaker/rust,jroesch/rust,bombless/rust,ejjeong/rust,carols10cents/rust,jroesch/rust,GBGamer/rust,ebfull/rust,jroesch/rust,erickt/rust,KokaKiwi/rust,seanrivera/rust,ktossell/rust,aneeshusa/rust,graydon/rust,dwillmer/rust,nwin/rust,dwillmer/rust,vhbit/rust,GBGamer/rust,l0kod/rust,mdinger/rust,avdi/rust,robertg/rust,pczarn/rust,mdinger/rust,carols10cents/rust,rohitjoshi/rust,robertg/rust,pelmers/rust,ejjeong/rust,AerialX/rust,krzysz00/rust,mihneadb/rust,mvdnes/rust,jbclements/rust,kimroen/rust,mvdnes/rust,aneeshusa/rust,pelmers/rust,philyoon/rust,aepsil0n/rust,bombless/rust,philyoon/rust,mvdnes/rust,AerialX/rust-rt-minimal,TheNeikos/rust,zubron/rust,ebfull/rust,avdi/rust,nwin/rust,AerialX/rust,P1start/rust,ebfull/rust,cllns/rust,GBGamer/rust,victorvde/rust,ruud-v-a/rust,AerialX/rust-rt-minimal,victorvde/rust,ejjeong/rust,graydon/rust,jbclements/rust,KokaKiwi/rust,zachwick/rust,AerialX/rust-rt-minimal,gifnksm/rust,rprichard/rust,0x73/rust,kimroen/rust,aepsil0n/rust,aepsil0n/rust,philyoon/rust,jroesch/rust,gifnksm/rust,ktossell/rust,bombless/rust,barosl/rust,robertg/rust,gifnksm/rust,jashank/rust,andars/rust,emk/rust,0x73/rust,mvdnes/rust,barosl/rust,stepancheg/rust-ide-rust,kimroen/rust,kwantam/rust,AerialX/rust,ruud-v-a/rust,nham/rust,dinfuehr/rust,hauleth/rust,aepsil0n/rust,omasanori/rust,ruud-v-a/rust,krzysz00/rust,dinfuehr/rust,zubron/rust,erickt/rust,0x73/rust,mahkoh/rust,dinfuehr/rust,mvdnes/rust,pczarn/rust,0x73/rust,pczarn/rust,ejjeong/rust,kwantam/rust,cllns/rust,dwillmer/rust,P1start/rust,mihneadb/rust,rohitjoshi/rust,miniupnp/rust,carols10cents/rust,aidancully/rust,seanrivera/rust,aneeshusa/rust,krzysz00/rust,aneeshusa/rust,pelmers/rust,zaeleus/rust,mdinger/rust,miniupnp/rust,nwin/rust,aidancully/rust,jroesch/rust,ruud-v-a/rust,emk/rust,nham/rust,jbclements/rust,jroesch/rust,mahkoh/rust,a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