Reindent build-mingw-w64-libraries.sh

This was left inconsistent after 3c1c81f321.

build-mingw-w64-libraries.sh

@@ -14,8 +14,8 @@ export PATH=$PREFIX/bin:$PATH
 
 cd mingw-w64/mingw-w64-libraries
 for lib in winpthreads winstorecompat; do
-cd $lib
-for arch in $ARCHS; do
+    cd $lib
+    for arch in $ARCHS; do
         mkdir -p build-$arch
         cd build-$arch
         ../configure --host=$arch-w64-mingw32 --prefix=$PREFIX/$arch-w64-mingw32 \
@@ -23,6 +23,6 @@ for arch in $ARCHS; do
         make -j$CORES
         make install
         cd ..
-done
-cd ..
+    done
+    cd ..
 done