[PATCH] Skip check for dlopen() when compiling libstdcxx with avrlibc

[Adrian Stratulat]

Hello,

II tried compiling avr-gcc (AVR 8-bit target) with libstdcxx support,
and even if I set the configure parameters to be "disable-shared" and
"enable-static", the "configure" step fails because it checks for
dlopen() support in avrlibc (which doesn't exist).

I see that in the newlib case, the failing step is skipped, so I've
just added branch to the condition, to skip the same check for
avrlibc.

Please double-check this patch, as it's my first commit to the GCC
project, and I had to manually adjust a couple of things for the
regeneration step to work out.

Thank you,
Adrian Stratulat
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