add config.mak.dist example for static-linked cross toolchain

config.mak.dist

@@ -36,6 +36,14 @@
 # MPC_VER =
 # MPFR_VER =
 
+# Something like the following can be used to produce a static-linked
+# toolchain that's deployable to any system with matching arch, using
+# an existing musl-targeted cross compiler. This only # works if the
+# system you build on can natively (or via binfmt_misc and # qemu) run
+# binaries produced by the existing toolchain (in this example, i486).
+
+# COMMON_CONFIG += CC="i486-linux-musl-gcc -static --static" CXX="i486-linux-musl-g++ -static --static"
+
 # Recommended options for smaller build for deploying binaries:
 
 # COMMON_CONFIG += CFLAGS="-g0 -Os" CXXFLAGS="-g0 -Os" LDFLAGS="-s"