Fix CDT debugger settings on Linux - remove .exe suffix

On Linux machines arm-none-eabi-gdb executable do not have .exe suffix.
On Windows machines - it is possible to run an executable without explicit .exe suffix.
This change fixes debugger settings for Linux hosts

Author: Alexander Zilberkant

tools/export/cdt/pyocd_settings.tmpl

@@ -49,7 +49,7 @@
 <booleanAttribute key="org.eclipse.cdt.debug.gdbjtag.core.useProjBinaryForImage" value="true"/>
 <booleanAttribute key="org.eclipse.cdt.debug.gdbjtag.core.useProjBinaryForSymbols" value="true"/>
 <booleanAttribute key="org.eclipse.cdt.debug.gdbjtag.core.useRemoteTarget" value="true"/>
-<stringAttribute key="org.eclipse.cdt.dsf.gdb.DEBUG_NAME" value="arm-none-eabi-gdb.exe"/>
+<stringAttribute key="org.eclipse.cdt.dsf.gdb.DEBUG_NAME" value="arm-none-eabi-gdb"/>
 <booleanAttribute key="org.eclipse.cdt.dsf.gdb.UPDATE_THREADLIST_ON_SUSPEND" value="false"/>
 <intAttribute key="org.eclipse.cdt.launch.ATTR_BUILD_BEFORE_LAUNCH_ATTR" value="2"/>
 <stringAttribute key="org.eclipse.cdt.launch.COREFILE_PATH" value=""/>