New comment by pullmoll on void-packages repository

https://github.com/void-linux/void-packages/pull/24258#issuecomment-757142780

Comment:
`common/build-styles/void-cross.sh` needs to be fixed for `libucontext-1.0`. It seems the CPPFLAGS are ignored now and the build fails to find `#include <string.h>`. This fixes the build - is it right?
```
@@ -317,8 +320,9 @@ _void_cross_build_libucontext() {
        cd ${wrksrc}/libucontext-${ver}
        # a terrible hack but seems to work for now
        CC="${cross_triplet}-gcc" AS="${cross_triplet}-as" AR="${cross_triplet}-ar" \
-       CPPFLAGS="-pipe ${cross_musl_cflags} -g0 -Os -nostdinc -isystem ${wrksrc}/build_root/usr/${cross_triplet}/usr/include" \
-       make ARCH=${cross_libucontext_arch} libucontext.a
+       make ARCH=${cross_libucontext_arch} \
+               CFLAGS="-pipe ${cross_musl_cflags} -g0 -Os -nostdinc -isystem ${wrksrc}/build_root/usr/${cross_triplet}/usr/include" \
+               libucontext.a
 
        cp libucontext.a ${wrksrc}/build_root/usr/${cross_triplet}/usr/lib
```