More CI tragets: Linux 32bit, LTO, Windows and Cosmopolitan

Atomics support in Windows requires libwinpthread*.dll at runtime. One
way to get it is to install it with MinGW package, and copy alongside
the executable.

Update test Makefile targets for windows executables.

Allow running tests with Wine: `make WINE=wine CONFIG_WIN3=y
...`. That's useful when Wine binfmt support cannot be installed such
as on the CI hosts.

Add PPC64LE architecture and try to fix flaky multi-arch CI in gcc:
https://github.com/tonistiigi/binfmt/issues/215

Makefile

@@ -29,6 +29,9 @@ ifeq ($(shell uname -s),FreeBSD)
 CONFIG_FREEBSD=y
 endif
 # Windows cross compilation from Linux
+# May need to have libwinpthread*.dll alongside the executable
+# (On Ubuntu/Debian may be installed with mingw-w64-x86-64-dev
+# to /usr/x86_64-w64-mingw32/lib/libwinpthread-1.dll)
 #CONFIG_WIN32=y
 # use link time optimization (smaller and faster executables but slower build)
 #CONFIG_LTO=y
@@ -82,6 +85,10 @@ ifdef CONFIG_WIN32
     CROSS_PREFIX?=x86_64-w64-mingw32-
   endif
   EXE=.exe
+else ifdef MSYSTEM
+  CONFIG_WIN32=y
+  CROSS_PREFIX?=
+  EXE=.exe
 else
   CROSS_PREFIX?=
   EXE=
@@ -189,11 +196,14 @@ endif
 
 ifndef CONFIG_COSMO
 ifndef CONFIG_DARWIN
+ifndef CONFIG_WIN32
 CONFIG_SHARED_LIBS=y # building shared libraries is supported
 endif
 endif
+endif
+
+PROGS=qjs$(EXE) qjsc$(EXE) run-test262$(EXE)
 
-PROGS=qjs$(EXE) qjsc$(EXE) run-test262
 ifneq ($(CROSS_PREFIX),)
 QJSC_CC=gcc
 QJSC=./host-qjsc
@@ -215,8 +225,10 @@ ifndef CONFIG_UBSAN
 PROGS+=examples/hello examples/test_fib
 # no -m32 option in qjsc
 ifndef CONFIG_M32
+ifndef CONFIG_WIN32
 PROGS+=examples/hello_module
 endif
+endif
 ifdef CONFIG_SHARED_LIBS
 PROGS+=examples/fib.so examples/point.so
 endif
@@ -232,9 +244,9 @@ QJS_LIB_OBJS=$(OBJDIR)/quickjs.o $(OBJDIR)/dtoa.o $(OBJDIR)/libregexp.o $(OBJDIR
 QJS_OBJS=$(OBJDIR)/qjs.o $(OBJDIR)/repl.o $(QJS_LIB_OBJS)
 
 HOST_LIBS=-lm -ldl -lpthread
-LIBS=-lm
+LIBS=-lm -lpthread
 ifndef CONFIG_WIN32
-LIBS+=-ldl -lpthread
+LIBS+=-ldl
 endif
 LIBS+=$(EXTRA_LIBS)
 
@@ -305,7 +317,7 @@ libunicode-table.h: unicode_gen
 	./unicode_gen unicode $@
 endif
 
-run-test262: $(OBJDIR)/run-test262.o $(QJS_LIB_OBJS)
+run-test262$(EXE): $(OBJDIR)/run-test262.o $(QJS_LIB_OBJS)
 	$(CC) $(LDFLAGS) -o $@ $^ $(LIBS)
 
 run-test262-debug: $(patsubst %.o, %.debug.o, $(OBJDIR)/run-test262.o $(QJS_LIB_OBJS))
@@ -348,8 +360,8 @@ clean:
 	rm -f *.a *.o *.d *~ unicode_gen regexp_test fuzz_eval fuzz_compile fuzz_regexp $(PROGS)
 	rm -f hello.c test_fib.c
 	rm -f examples/*.so tests/*.so
-	rm -rf $(OBJDIR)/ *.dSYM/ qjs-debug
-	rm -rf run-test262-debug
+	rm -rf $(OBJDIR)/ *.dSYM/ qjs-debug$(EXE)
+	rm -rf run-test262-debug$(EXE)
 	rm -f run_octane run_sunspider_like
 
 install: all
@@ -427,25 +439,27 @@ ifdef CONFIG_SHARED_LIBS
 test: tests/bjson.so examples/point.so
 endif
 
-test: qjs
-	./qjs tests/test_closure.js
-	./qjs tests/test_language.js
-	./qjs --std tests/test_builtin.js
-	./qjs tests/test_loop.js
-	./qjs tests/test_bigint.js
-	./qjs tests/test_std.js
-	./qjs tests/test_worker.js
-	./qjs tests/test_cyclic_import.js
+test: qjs$(EXE)
+	$(WINE) ./qjs$(EXE) tests/test_closure.js
+	$(WINE) ./qjs$(EXE) tests/test_language.js
+	$(WINE) ./qjs$(EXE) --std tests/test_builtin.js
+	$(WINE) ./qjs$(EXE) tests/test_loop.js
+	$(WINE) ./qjs$(EXE) tests/test_bigint.js
+	$(WINE) ./qjs$(EXE) tests/test_cyclic_import.js
+	$(WINE) ./qjs$(EXE) tests/test_worker.js
+ifndef CONFIG_WIN32
+	$(WINE) ./qjs$(EXE) tests/test_std.js
+endif
 ifdef CONFIG_SHARED_LIBS
-	./qjs tests/test_bjson.js
-	./qjs examples/test_point.js
+	$(WINE) ./qjs$(EXE) tests/test_bjson.js
+	$(WINE) ./qjs$(EXE) examples/test_point.js
 endif
 
-stats: qjs
-	./qjs -qd
+stats: qjs$(EXE)
+	$(WINE) ./qjs$(EXE) -qd
 
-microbench: qjs
-	./qjs --std tests/microbench.js
+microbench: qjs$(EXE)
+	$(WINE) ./qjs$(EXE) --std tests/microbench.js
 
 ifeq ($(wildcard test262o/tests.txt),)
 test2o test2o-update: