Do not assume architecture dir, specify by environment variable

Makefile.am

@@ -60,9 +60,10 @@ dosbox-x.app: $(MACOS_BINARIES) contrib/macos/dosbox.icns src/tool/mach-o-matic
 	done
 # Fix the linker search paths of the libraries we copied
 	@for dir in dosbox-x.app/Contents/MacOS/arm64 dosbox-x.app/Contents/MacOS/x86_64; do \
-		if [ `ls  $$dir/*.dylib 2>/dev/null | wc -l` -gt 0 ]; then \
+		if [ `ls $$dir/*.dylib 2>/dev/null | wc -l` -gt 0 ]; then \
+			arpf=`basename $$dir`; \
 			for dylib in $$dir/*.dylib; do \
-				[ -f "$$dylib" ] && src/tool/mach-o-matic "$$dylib" || exit 1; \
+				[ -f "$$dylib" ] && (ARCHPREF=$$arpf src/tool/mach-o-matic "$$dylib") || exit 1; \
 			done; \
 		fi; \
 	done

src/tool/mach-o-matic.cpp

@@ -22,6 +22,8 @@
 
 #include <string>
 
+std::string arch_prefix = "arm64";
+
 using namespace std;
 
 bool str_startswith(const char *str,const char *starts) {
@@ -40,25 +42,25 @@ string dylib_replace(string path) {
         fn = s;
 
     if (str_startswith(s,"/opt/homebrew/"))
-        return string("@executable_path/arm64/") + fn;
+        return string("@executable_path/") + arch_prefix + "/" + fn;
     if (str_startswith(s,"/usr/local/Homebrew/"))
-        return string("@executable_path/x86_64/") + fn;
+        return string("@executable_path/") + arch_prefix + "/" + fn;
     if (str_startswith(s,"/usr/local/lib/"))
-        return string("@executable_path/x86_64/") + fn;
+        return string("@executable_path/") + arch_prefix + "/" + fn;
     if (str_startswith(s,"/usr/local/opt/"))
-        return string("@executable_path/x86_64/") + fn;
+        return string("@executable_path/") + arch_prefix + "/" + fn;
     if (str_startswith(s,"/usr/local/Cellar/"))
-        return string("@executable_path/x86_64/") + fn;
+        return string("@executable_path/") + arch_prefix + "/" + fn;
 
     if (str_startswith(s,"@loader_path/")) { /* often in Brew followed by ../../.. etc */
         s = fn;
         while (!strncmp(s,"../",3)) s += 3;
         printf("'%s' = '%s'\n",path.c_str(),s);
-        return string("@executable_path/arm64/") + s;
+        return string("@executable_path/") + arch_prefix + "/" + s;
     }
 
     if (str_startswith(s,"@rpath/"))
-        return string("@executable_path/arm64/") + fn;
+        return string("@executable_path/") + arch_prefix + "/" + fn;
 
     return path;
 }
@@ -104,6 +106,11 @@ int main(int argc,char **argv) {
         return 1;
     }
 
+    {
+        char *x = getenv("ARCHPREF");
+        if (x != NULL) arch_prefix = x;
+    }
+
     fpath = argv[1];
     if (lstat(fpath.c_str(),&st) != 0) {
         fprintf(stderr,"Cannot stat %s\n",fpath.c_str());