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document that clang generates larger binaries

clang (from LLVM) can be used to compile against dietlibc, but it can
not be used to compile dietlibc itself.  The reason is that dietlibc
uses gas (the GNU assembler, part of binutils) features in the assembly
parts that are not yet supported by clang.

The build process compensates by passing -fno-integrated-as to clang,
but that makes compilation with clang much slower than compilation with
gcc.

Still, the end result appears to work.

Note that the resulting binaries are larger. Here is the diet binary
for comparison. Compiled with gcc 5.2:

-rwxr-xr-x    1 root     root         8176 Jul  4 20:43 diet

Compiled with clang 3.6.2:

-rwxr-xr-x    1 leitner  users        8560 Jul 29 14:49 bin-x86_64/diet-i