Use --disable-auto-import linker switch in Mingw builds, too.

This is evidently the default on buildfarm member narwhal, but that is a pretty ancient Mingw version, and there is reason to think that more recent versions of GNU ld have this feature turned on by default. Since we are trying to achieve consistency of link behavior across all Windows toolchains, let's just make sure here.

Use --disable-auto-import linker switch in Mingw builds, too.
This is evidently the default on buildfarm member narwhal, but that is a pretty ancient Mingw version, and there is reason to think that more recent versions of GNU ld have this feature turned on by default. Since we are trying to achieve consistency of link behavior across all Windows toolchains, let's just make sure here.
1c9acd5c · Tom Lane · 30657b79 · 1c9acd5c
Commit 1c9acd5c authored Feb 12, 2014 by Tom Lane
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src/template/win32 src/template/win32 +5 -2

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--- a/src/template/win32
+++ b/src/template/win32
+# src/template/win32
+
 # --allow-multiple-definition is required to link pg_dump because it finds
-# pg_toupper() in both libpq and pgport
-LDFLAGS="-Wl,--allow-multiple-definition"
+# pg_toupper() etc. in both libpq and pgport
+# --disable-auto-import is to ensure we get MSVC-like linking behavior
+LDFLAGS="-Wl,--allow-multiple-definition -Wl,--disable-auto-import"