Inexplicably fix OS X's make happy by removing spaces

[tyler]

When attempting to make package on OS X, I was confronted with this error:

#
# Collect metadata on the sysroot and perform sanity checks.
#
mkdir -p "/opt/wasi-sdk/share/sysroot/share/wasm32-wasi"
# Collect symbol information.
# TODO: Use llvm-nm --extern-only instead of grep. This is blocked on
# LLVM PR40497, which is fixed in 9.0, but not in 8.0.
/opt/wasi-sdk/bin/llvm-nm --defined-only "/opt/wasi-sdk/share/sysroot/lib/wasm32-wasi"/libc.a "/opt/wasi-sdk/share/sysroot/lib/wasm32-wasi"/*.o \
        |grep ' [[:upper:]] ' |sed 's/.* [[:upper:]] //' |LC_COLLATE=C sort > "/opt/wasi-sdk/share/sysroot/share/wasm32-wasi/defined-symbols.txt"
for undef_sym in $(/opt/wasi-sdk/bin/llvm-nm --undefined-only "/opt/wasi-sdk/share/sysroot/lib/wasm32-wasi"/*.a "/opt/wasi-sdk/share/sysroot/lib/wasm32-wasi"/*.o |grep ' U ' |sed 's/.* U //' |LC_COLLATE=C sort |uniq); do \
        grep -q '\<'$undef_sym'\>' "/opt/wasi-sdk/share/sysroot/share/wasm32-wasi/defined-symbols.txt" || echo $undef_sym; \
    done   > "/opt/wasi-sdk/share/sysroot/share/wasm32-wasi/undefinols.txt"ls.txt"
/bin/sh: -c: line 0: unexpected EOF while looking for matching `"'
/bin/sh: -c: line 1: syntax error: unexpected end of file
make[1]: *** [finish] Error 2
make: *** [build/reference-sysroot.BUILT] Error 2

It appears that the done > "/opt/wasi-sdk/share/sysroot/share/wasm32-wasi/undefinols.txt"ls.txt" bit is getting corrupted. I tried several things to figure out what was going on. However, simply removing the extra spaces between done and > seems to have fixed it. I have no idea why. But the build reliably works now.