testsuite: gluefile file need to be prefixed

When the status wrapper is used, the gluefile need to be prefixed with
-Wl, in order for the test cases to have the dump files with the
expected names.

2022-09-14  Torbjörn SVENSSON  <torbjorn.svensson@foss.st.com>

gcc/testsuite/
	PR target/95720
	* lib/g++.exp: Moved gluefile block to after flags have been
	  prefixed for the target_compile call.
	* lib/gcc.exp: Likewise.
	* lib/wrapper.exp: Reset adjusted state flag.

Co-Authored-By: Yvan ROUX <yvan.roux@foss.st.com>
Signed-off-by: Torbjörn SVENSSON <torbjorn.svensson@foss.st.com>