Up OS/2 stack size and remove OS/2 build options

configure.in

@@ -1352,7 +1352,7 @@ case "$target" in
         CFLAGS="$CFLAGS -Zomf"
         CXXFLAGS="$CXXFLAGS -Zomf"
         DSO_LDOPTS='-Zdll'
-        BIN_FLAGS='-Zlinker /ST:0x64000'
+        BIN_FLAGS='-Zlinker /ST:0x100000'
         IMPLIB='emximp -o'
         FILTER='emxexp -o'
         MOZ_DEBUG_FLAGS="-g -fno-inline"
@@ -4571,24 +4571,6 @@ else
 fi
 AC_LANG_C
 
-dnl ========================================================
-dnl =
-dnl = OS/2 Build Options
-dnl = 
-dnl ========================================================
-MOZ_ARG_HEADER(OS/2 Build Options)
-
-MOZ_ARG_WITH_STRING(os2emx,
-[  --with-os2emx=FORMAT    Build for OS/2 with emx+gcc, set to OMF or A.OUT],
-    MOZ_OS2_TOOLS=EMX
-    MOZ_OS2_EMX_OBJECTFORMAT="$withval"
-    AC_DEFINE(XP_OS2_EMX) )
-
-MOZ_ARG_WITH_BOOL(os2vacpp,
-[  --with-os2vacpp         Build for OS/2 with VAC++],
-    MOZ_OS2_TOOLS=VACPP
-    AC_DEFINE(XP_OS2_VACPP) )
-
 dnl ========================================================
 dnl =
 dnl = Build depencency options