Fixed release JSexec build (yes, it's multi-threaded now).

src/sbbs3/jsexec.dsp

@@ -42,7 +42,7 @@ RSC=rc.exe
 # PROP Ignore_Export_Lib 0
 # PROP Target_Dir ""
 # ADD BASE CPP /nologo /W3 /GX /O2 /D "WIN32" /D "NDEBUG" /D "_CONSOLE" /D "_MBCS" /YX /FD /c
-# ADD CPP /nologo /W3 /GX /O2 /I "..\..\include\mozilla\js" /I "../xpdev" /I "../smblib" /I "../uifc" /I "../conio" /D "WIN32" /D "NDEBUG" /D "_CONSOLE" /D "_MBCS" /FD /c
+# ADD CPP /nologo /MT /W3 /GX /O2 /I "..\..\include\mozilla\js" /I "../xpdev" /I "../smblib" /I "../uifc" /I "../conio" /D "WIN32" /D "NDEBUG" /D "_CONSOLE" /D "_MBCS" /FD /c
 # SUBTRACT CPP /YX
 # ADD BASE RSC /l 0x409 /d "NDEBUG"
 # ADD RSC /l 0x409 /d "NDEBUG"