We don't need __va_copy anymore.

src/Makefile

@@ -45,11 +45,6 @@ LIBRARY = $(LIBRARY_NAME).$(SO_SUFFIX).$(LIB_VER)
 MKSHLIB = $(CC) -shared
 LIB_OPTS = -Wl,-soname=$(LIBRARY) -Wl,-exclude-libs=libjs.a
 SHFLAGS = -fPIC
-SMCFLAGS = -DHAVE_VA_COPY -DVA_COPY=__va_copy
-
-ifeq ($(shell test -f /etc/alpine-release && echo yes),yes)
-    SMCFLAGS = -DHAVE_VA_COPY -DVA_COPY=va_copy
-endif
 
 ifeq ($(OS_ARCH),FreeBSD)
 	PREFIX ?= /usr/local
@@ -64,13 +59,6 @@ ifeq ($(OS_ARCH),Darwin)
   MKSHLIB = $(CC) -dynamiclib -framework System
   LIB_OPTS = -install_name $(PREFIX)/lib/$(notdir $@)
   SHFLAGS =
-  ifeq ($(MAC_GT_OS11),false)
-    MAC_MINOR_VERSION := $(shell sw_vers -productVersion | cut -d. -f2)
-    MAC_GT_10_5 := $(shell [ $(MAC_MINOR_VERSION) -le 5 ] && echo false)
-    ifeq ($(MAC_GT_10_5),false)
-      SMCFLAGS =
-    endif
-  endif
 endif
 
 PREFIX ?= /usr
@@ -95,11 +83,11 @@ MAN_PREFIX = $(PREFIX)/share/man
 all: testpactester
 
 jsapi_buildstamp: spidermonkey/js/src
-	cd spidermonkey && SMCFLAGS="$(SHFLAGS) $(SMCFLAGS)" $(MAKE) jsapi
+	cd spidermonkey && SMCFLAGS="$(SHFLAGS)" $(MAKE) jsapi
 	touch jsapi_buildstamp
 
 spidermonkey/libjs.a: spidermonkey/js/src
-	cd spidermonkey && SMCFLAGS="$(SHFLAGS) $(SMCFLAGS)" $(MAKE) jslib
+	cd spidermonkey && SMCFLAGS="$(SHFLAGS)" $(MAKE) jslib
 
 pacparser.o: pacparser.c pac_utils.h pacparser.h jsapi_buildstamp
 	$(CC) $(MAINT_CFLAGS) $(CFLAGS) $(SHFLAGS) -c pacparser.c -o pacparser.o