Option --assume-execute-permission

modified:   main.cpp
	modified:   options.h
	modified:   p_unix.cpp
https://github.com/upx/upx/issues/256

src/main.cpp

@@ -872,6 +872,9 @@ static int do_option(int optc, const char *arg)
     case 677:
         opt->o_unix.force_pie = true;
         break;
+    case 678:
+        opt->o_unix.assume_execute_permission = true;
+        break;
 
     case '\0':
         return -1;
@@ -1024,6 +1027,7 @@ static const struct mfx_option longopts[] =
     {"preserve-build-id",   0, 0, 675},
     {"android-shlib",       0, 0, 676},
     {"force-pie",           0, 0, 677},
+    {"assume-execute-permission", 0, 0, 678},
     // watcom/le
     {"le",               0x10, 0, 620},     // produce LE output
     // win32/pe