build: Build PE modules with -mcmodel=small.

This breaks MinGW autoimport mechanism but nothing in Proton should be
using it. Instead, any PE module should be using standard dllimport and
ntdll will do the relocations as expected. We also don't and hopefully
never have modules larger than 2GB, so 32-bit %rip relative offsets
should be enough for everything.

This will OTOH save a lot of .refptr indirections, that are otherwise
generated for any extern symbols, even though they are later linked in
the same module, making all code smaller and maybe a little faster.

Makefile.in

@@ -180,6 +180,7 @@ SANITY_FLAGS   := -fwrapv -fno-strict-aliasing
 DEBUG_FLAGS    := -gdwarf-2 -gstrict-dwarf
 COMMON_FLAGS    = $(DEBUG_FLAGS) $(OPTIMIZE_FLAGS) $(SANITY_FLAGS) -ffile-prefix-map=$(CCACHE_BASEDIR)=.
 COMMON_FLAGS32 := -mstackrealign
+COMMON_FLAGS64 := -mcmodel=small
 CARGO_BUILD_ARG := --release
 
 ##

configure.sh

@@ -182,7 +182,7 @@ function configure() {
 #
 
 arg_steamrt="soldier"
-arg_protonsdk_image="registry.gitlab.steamos.cloud/proton/soldier/sdk:0.20220601.0-1"
+arg_protonsdk_image="registry.gitlab.steamos.cloud/proton/soldier/sdk:0.20220601.0-4"
 arg_no_protonsdk=""
 arg_build_name=""
 arg_container_engine=""