minimal-sdk: make Clang's gcc-compat functional

The `gcc.exe` provided by Clang needs another DLL that was not required
when `gcc.exe` really was GCC.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>

.sparse/minimal-sdk

@@ -33,6 +33,7 @@
 # The gcc-compat package provides a link from
 # gcc.exe to clang
 /clangarm64/bin/gcc.exe
+/clangarm64/bin/libc++.dll
 
 # gettext (msgfmt)
 /clangarm64/bin/msgfmt.exe