bump gcc for bootstrap

On Windows, the gcc crate would send /Wall to msvc, which would cause builds to get flooded with warnings, exploding compile times from one hour to more than 72! The gcc crate version 0.3.54 changes this behavior to send /W4 instead, which greatly cuts down on cl.exe flooding the command prompt window with warnings.
alexcrichton · Sep 12, 2017 · 81ebab6 · 81ebab6
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commit 81ebab6
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diff --git a/src/Cargo.lock b/src/Cargo.lock
diff --git a/src/bootstrap/Cargo.toml b/src/bootstrap/Cargo.toml
@@ -34,7 +34,7 @@ cmake = "0.1.23"
 filetime = "0.1"
 num_cpus = "1.0"
 getopts = "0.2"
-gcc = "0.3.50"
+gcc = "0.3.54"
 libc = "0.2"
 serde = "1.0.8"
 serde_derive = "1.0.8"