building libmvndnative.* creates root files in target directory

[hboutemy]

$ cd native
$ make native-all
...
$ ls -l target/native-*
target/native-FreeBSD-x86:
total 12
-rwxr-xr-x 1 root root 4803 mai    1 10:13 libmvndnative.so
-rw-r--r-- 1 root root 1344 mai    1 10:13 mvndnative.o

target/native-FreeBSD-x86_64:
total 12
-rwxr-xr-x 1 root root 6755 mai    1 10:13 libmvndnative.so
-rw-r--r-- 1 root root 2240 mai    1 10:13 mvndnative.o

target/native-Linux-arm:
total 12
-rwxr-xr-x 1 root root 7804 mai    1 10:13 libmvndnative.so
-rw-r--r-- 1 root root 1584 mai    1 10:13 mvndnative.o

target/native-Linux-arm64:
total 16
-rwxr-xr-x 1 root root 8864 mai    1 10:13 libmvndnative.so
-rw-r--r-- 1 root root 1976 mai    1 10:13 mvndnative.o

target/native-Linux-armv6:
total 16
-rwxr-xr-x 1 herve herve 8564 mai    1 10:13 libmvndnative.so
-rw-r--r-- 1 herve herve 1520 mai    1 10:13 mvndnative.o

target/native-Linux-armv7:
total 12
-rwxr-xr-x 1 root root 7824 mai    1 10:13 libmvndnative.so
-rw-r--r-- 1 root root 1404 mai    1 10:13 mvndnative.o

target/native-Linux-ppc64:
total 20
-rwxr-xr-x 1 root root 70304 mai    1 10:13 libmvndnative.so
-rw-r--r-- 1 root root  2536 mai    1 10:13 mvndnative.o

target/native-Linux-x86:
total 20
-rwxr-xr-x 1 herve herve 15188 mai    1 10:13 libmvndnative.so
-rw-r--r-- 1 herve herve  1988 mai    1 10:13 mvndnative.o

target/native-Linux-x86_64:
total 16
-rwxr-xr-x 1 root root 8384 mai    1 10:13 libmvndnative.so
-rw-r--r-- 1 root root 2384 mai    1 10:13 mvndnative.o

target/native-Mac-arm64:
total 56
-rwxr-xr-x 1 root root 50801 mai    1 10:13 libmvndnative.jnilib
-rw-r--r-- 1 root root  2160 mai    1 10:13 mvndnative.o

target/native-Mac-x86:
total 16
-rwxr-xr-x 1 root root 9044 mai    1 10:13 libmvndnative.jnilib
-rw-r--r-- 1 root root 1492 mai    1 10:13 mvndnative.o

target/native-Mac-x86_64:
total 16
-rwxr-xr-x 1 root root 9260 mai    1 10:13 libmvndnative.jnilib
-rw-r--r-- 1 root root 2156 mai    1 10:13 mvndnative.o

target/native-Windows-x86:
total 92
-rwxr-xr-x 1 herve herve 87265 mai    1 10:13 mvndnative.dll
-rw-r--r-- 1 herve herve  1323 mai    1 10:13 mvndnative.o

target/native-Windows-x86_64:
total 108
-rwxr-xr-x 1 herve herve 103015 mai    1 10:13 mvndnative.dll
-rw-r--r-- 1 herve herve   1665 mai    1 10:13 mvndnative.o

majority of outputs are root, only a few respect user (Windows and Linux x86 and armv6)

[hboutemy]

first research results: the 4 cases respecting user are in fact those having a script that does proper job for user detection:
https://github.com/apache/maven-mvnd/tree/master/native/docker
for example https://github.com/apache/maven-mvnd/blob/master/native/docker/dockcross-linux-x86#L242 with value from https://github.com/apache/maven-mvnd/blob/master/native/docker/dockcross-linux-x86#L198