gcc: Add README to gcc package explaining build-deps on host machine.

Signed-off-by: Christian Beier <dontmind@freeshell.org>

diff --git a/devel/gcc/README b/devel/gcc/README
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index 0000000..f172bb9
--- /dev/null
+++ b/devel/gcc/README
@@ -0,0 +1,9 @@
+Native GCC that runs on target.
+
+Note that building this one is a bit tricky. First and foremost, your build machine
+needs to have the gcc build-deps installed as well, i.e. mpfr, gmp and mpc, amongst
+others.
+
+For now, this was only tested for a mips target. Others to be done...
+
+Christian Beier <cb@shoutrlabs.com>
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