Make dbghelp look for PDBs next to their exe/dll. #836

Job	Run time
Windows AArch64	39s
Build Targets (wasm32-unknown-unknown)	15s
Docker (aarch64-unknown-linux-gnu)	52s
Build Targets (wasm32-wasi)	15s
iOS (aarch64-apple-ios, iphoneos)	39s
Docker (arm-unknown-linux-gnueabihf)	31s
Build Targets (x86_64-unknown-fuchsia)	16s
iOS (x86_64-apple-ios, iphonesimulator)	41s
Docker (armv7-unknown-linux-gnueabihf)	32s
Miri	2m 5s
Build Targets (x86_64-fortanix-unknown-sgx)	15s
Docker (i586-unknown-linux-gnu)	33s
Build Targets (x86_64-unknown-illumos)	18s
Docker (i686-unknown-linux-gnu)	31s
MSRV	3m 4s
Rustfmt	7s
Docker (powerpc64-unknown-linux-gnu)	35s
Docker (s390x-unknown-linux-gnu)	45s
Test (ubuntu-20.04, stable)	1m 48s
Docker (x86_64-pc-windows-gnu)	55s
Test (ubuntu-20.04, beta)	1m 48s
Docker (x86_64-unknown-linux-gnu)	38s
Test (ubuntu-20.04, nightly)	2m 8s
Docker (x86_64-unknown-linux-musl)	30s
Test (macos-latest, stable)	4m 5s
Docker (arm-linux-androideabi)	1m 26s
Test (macos-latest, nightly)	4m 23s
Docker (armv7-linux-androideabi)	1m 13s
Test (windows-latest, stable-x86_64-msvc)	2m 20s
Docker (aarch64-linux-android)	1m 12s
Test (windows-latest, stable-i686-msvc)	2m 25s
Docker (i686-linux-android)	1m 3s
Docker (x86_64-linux-android)	1m 19s
Test (windows-latest, stable-x86_64-gnu)	2m 52s
	42m 58s

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