configure: Avoid use of param. expansion when using gdb_version

$gdb_version is now used in more than one conditional case and its usage
in such cases may increase in the future. Therefore, avoid using shell
parameter expansion when using it by setting gdb_version to its final
form.

Signed-off-by: Gustavo Romero <gustavo.romero@linaro.org>
Message-Id: <20240804161850.2646299-3-gustavo.romero@linaro.org>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20240813202329.1237572-5-alex.bennee@linaro.org>

configure

@@ -1103,8 +1103,10 @@ fi
 # gdb test
 
 if test -n "$gdb_bin"; then
-    gdb_version=$($gdb_bin --version | head -n 1)
-    if version_ge ${gdb_version##* } 9.1; then
+    gdb_version_string=$($gdb_bin --version | head -n 1)
+    # Extract last field in the version string
+    gdb_version=${gdb_version_string##* }
+    if version_ge $gdb_version 9.1; then
         gdb_arches=$($python "$source_path/scripts/probe-gdb-support.py" $gdb_bin)
     else
         gdb_bin=""
@@ -1673,7 +1675,7 @@ for target in $target_list; do
           echo "GDB=$gdb_bin" >> $config_target_mak
       fi
 
-      if test "${gdb_arches#*aarch64}" != "$gdb_arches" && version_ge ${gdb_version##* } 15.0; then
+      if test "${gdb_arches#*aarch64}" != "$gdb_arches" && version_ge $gdb_version 15.0; then
           echo "GDB_HAS_MTE=y" >> $config_target_mak
       fi