patch 9.0.1900: Configure script uses non-portable == comparison

Problem:  Configure script uses non-portable == comparison
Solution: Use the standard and portable "=" instead

closes: #13095
closes: #13099

Signed-off-by: Christian Brabandt <cb@256bit.org>
Co-authored-by: Yee Cheng Chin <ychin.git@gmail.com>

src/auto/configure

@@ -7045,7 +7045,7 @@ else $as_nop
          "major_minor='${vi_cv_var_python3_stable_abi}'.split('.'); print('0x{0:X}'.format( (int(major_minor.__getitem__(0))<<24) + (int(major_minor.__getitem__(1))<<16) ))"`
 fi
 
-        if test "X$vi_cv_var_python3_stable_abi_hex" == "X"; then
+        if test "X$vi_cv_var_python3_stable_abi_hex" = "X"; then
           as_fn_error $? "can't parse Python 3 stable ABI version. It should be \"<major>.<minor>\"" "$LINENO" 5
         fi
       fi

src/configure.ac

@@ -1511,7 +1511,7 @@ if test "$enable_python3interp" = "yes" -o "$enable_python3interp" = "dynamic";
          vi_cv_var_python3_stable_abi_hex=`
          ${vi_cv_path_python3} -c \
          "major_minor='${vi_cv_var_python3_stable_abi}'.split('.'); print('0x{0:X}'.format( (int(major_minor.__getitem__(0))<<24) + (int(major_minor.__getitem__(1))<<16) ))"` ])
-        if test "X$vi_cv_var_python3_stable_abi_hex" == "X"; then
+        if test "X$vi_cv_var_python3_stable_abi_hex" = "X"; then
           AC_MSG_ERROR([can't parse Python 3 stable ABI version. It should be "<major>.<minor>"])
         fi
       fi

src/version.c

@@ -699,6 +699,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1900,
 /**/
     1899,
 /**/