build-mingw-w64: Fix installing COPYING files on macOS

The install(1) tool on macOS doesn't support the -D option for
creating directories at the same time while installing files.
Therefore, run a separate step for creating directories. Doing that
with "mkdir -p", even if install(1) also could do that with the -d
option (likewise with a separate command).

Also stop specifying the destination file name, when it's equal to
the source files, now that we know that the destination directory
already exists.

build-mingw-w64-libraries.sh

@@ -47,7 +47,8 @@ for lib in winpthreads winstorecompat; do
         make -j$CORES
         make install
         cd ..
-        install -Dm644 COPYING "$arch_prefix/share/mingw32/COPYING.${lib}.txt"
+        mkdir -p "$arch_prefix/share/mingw32"
+        install -m644 COPYING "$arch_prefix/share/mingw32/COPYING.${lib}.txt"
     done
     cd ..
 done

build-mingw-w64-tools.sh

@@ -92,7 +92,8 @@ cd build${CROSS_NAME}
 ../configure --prefix="$PREFIX" $CONFIGFLAGS
 $MAKE -j$CORES
 $MAKE install-strip
-install -Dm644 ../COPYING "$PREFIX/share/gendef/COPYING"
+mkdir -p "$PREFIX/share/gendef"
+install -m644 ../COPYING "$PREFIX/share/gendef"
 cd ../../widl
 [ -z "$CLEAN" ] || rm -rf build${CROSS_NAME}
 mkdir -p build${CROSS_NAME}
@@ -100,7 +101,8 @@ cd build${CROSS_NAME}
 ../configure --prefix="$PREFIX" --target=$ANY_ARCH-w64-mingw32 --with-widl-includedir="$INCLUDEDIR" $CONFIGFLAGS
 $MAKE -j$CORES
 $MAKE install-strip
-install -Dm644 ../../../COPYING "$PREFIX/share/widl/COPYING"
+mkdir -p "$PREFIX/share/widl"
+install -m644 ../../../COPYING "$PREFIX/share/widl"
 cd ..
 cd "$PREFIX/bin"
 # The build above produced $ANY_ARCH-w64-mingw32-widl, add symlinks to it

build-mingw-w64.sh

@@ -126,7 +126,8 @@ done
 cd ..
 
 for arch in $ARCHS; do
+    mkdir -p "$PREFIX/$arch-w64-mingw32/share/mingw32"
     for file in COPYING COPYING.MinGW-w64/COPYING.MinGW-w64.txt COPYING.MinGW-w64-runtime/COPYING.MinGW-w64-runtime.txt; do
-        install -Dm644 "$file" "$PREFIX/$arch-w64-mingw32/share/mingw32/$(basename "$file")"
+        install -m644 "$file" "$PREFIX/$arch-w64-mingw32/share/mingw32"
     done
 done