build: set ELECTRUM_ECC_DONT_COMPILE=1, instead manually build lib

Haven't checked if electrum-ecc compiles libsecp reproducibly.
For now let's just keep the old flow.
(but if we spent time on making that compilation reproducible,
the appimage and the macos builds could use it directly)

contrib/build-wine/build-electrum-git.sh

@@ -32,6 +32,7 @@ export AIOHTTP_NO_EXTENSIONS=1
 export YARL_NO_EXTENSIONS=1
 export MULTIDICT_NO_EXTENSIONS=1
 export FROZENLIST_NO_EXTENSIONS=1
+export ELECTRUM_ECC_DONT_COMPILE=1
 
 info "Installing requirements..."
 $WINE_PYTHON -m pip install --no-build-isolation --no-dependencies --no-binary :all: --no-warn-script-location \