lcov: Fix --remove pattern matching

The --remove option of lcov now consider the pattern passed as parameter
as a full path, and not only a part of the filename.

This behavior was discovered by using AX_CODE_COVERAGE[1] m4 macro from
a directory in $HOME/tmp. The macro itself calls lcov with
`--remove "/tmp/*"`.

[1]: https://www.gnu.org/software/autoconf-archive/ax_code_coverage.html

Signed-off-by: Gabriel Laskar <[email protected]>

Author: GabrielL

bin/lcov

@@ -2915,7 +2915,7 @@ sub remove()
 
 		foreach $pattern (@pattern_list)
 		{
-			$match_found ||= ($filename =~ (/$pattern$/));
+			$match_found ||= ($filename =~ (/^$pattern$/));
 		}