Add support for compiling make against musl

Add generated headers from runing configure and make against a musl
sysroot.

mkdir -p soong/linux_musl/tmp
cd soong/linux_musl/tmp
../../../configure CC=/tmp/musl-sysroot/bin/musl-clang
make -j32 -k
cp src/config.h lib/fnmatch.h lib/glob.h ..

Bug: 190084016
Test: m out/soong/host/linux-x86/bin/make with  musl
Change-Id: Ic45275d1dd601481307a9a8dd090bdfb34b7a138