Recent GCC complain that an assignment involving a transfer statement
might potentially overflow the destination buffer. This prevented a
build on the SuSE build server.

Replaced this with a proper C string pointer.

Error message there:

 ../src/elpa_driver/legacy_interface/./elpa_driver_c_interface_template.X90:117:0:

        methodFortran(1:charCount) = transfer(method(1:charCount), methodFortran)

 Warning: '__builtin_memset': writing between 1 and 2147483640 bytes into a region of size 0 overflows the destination [-Wstringop-overflow=]

 [...]

 I: Statement might potentially overflow a destination buffer, where a size larger
     than the actual buffer was specified
 E: elpa destbufferoverflow Warning: '__builtin_memset'