add more patches for GCC 4.2.1 #78
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when GCC_CONFIG_FULL contains variable assignment items like AR=foo, it chokes. add hunk fixing that from more recent autoconf output.
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the first one makes configure compatible with the way mcm calls it (--options mixed with VAR=value assignments, gcc choked on the latter).
second one fixes a build error that happens when a recent GCC is used as the host compiler.
unfortunately, i couldn't get it to build completely, since GCC 4.2.1 insists on building libgcc and crt bits during "stage1" gcc build, which requires that musl's headers are already installed, at which point i decided to use musl-cross instead which has a traditional 2-stage build.
PR is submitted anyway, to document the steps needed to get to that point; maybe someone else will step up to fix the mentioned incompatibility.