Dockerfile.mingw: Parallel build

Dockerfile.mingw

@@ -47,7 +47,7 @@ RUN tar xf gmp-6.3.0.tar.xz && \
         --disable-cxx \
         --enable-fat \
         CFLAGS="-mtune=generic -O2 -g0" && \
-    make install
+    make -j$(nproc) install
 
 RUN tar xf expat-2.5.0.tar.bz2 && \
     cd expat-2.5.0 && \
@@ -57,7 +57,7 @@ RUN tar xf expat-2.5.0.tar.bz2 && \
         --prefix=/usr/local/$HOST \
         --host=$HOST \
         --build=`dpkg-architecture -qDEB_BUILD_GNU_TYPE` && \
-    make install
+    make -j$(nproc) install
 
 RUN tar xf sqlite-autoconf-3430100.tar.gz && \
     cd sqlite-autoconf-3430100 && \
@@ -67,7 +67,7 @@ RUN tar xf sqlite-autoconf-3430100.tar.gz && \
         --prefix=/usr/local/$HOST \
         --host=$HOST \
         --build=`dpkg-architecture -qDEB_BUILD_GNU_TYPE` && \
-    make install
+    make -j$(nproc) install
 
 RUN tar xf zlib-1.3.tar.gz && \
     cd zlib-1.3 && \
@@ -81,7 +81,7 @@ RUN tar xf zlib-1.3.tar.gz && \
         --libdir=/usr/local/$HOST/lib \
         --includedir=/usr/local/$HOST/include \
         --static && \
-    make install
+    make -j$(nproc) install
 
 RUN tar xf c-ares-1.19.1.tar.gz && \
     cd c-ares-1.19.1 && \
@@ -93,7 +93,7 @@ RUN tar xf c-ares-1.19.1.tar.gz && \
         --host=$HOST \
         --build=`dpkg-architecture -qDEB_BUILD_GNU_TYPE` \
         LIBS="-lws2_32" && \
-    make install
+    make -j$(nproc) install
 
 RUN tar xf libssh2-1.11.0.tar.bz2 && \
     cd libssh2-1.11.0 && \
@@ -106,12 +106,12 @@ RUN tar xf libssh2-1.11.0.tar.bz2 && \
         --without-openssl \
         --with-wincng \
         LIBS="-lws2_32" && \
-    make install
+    make -j$(nproc) install
 
 ARG ARIA2_VERSION=master
 ARG ARIA2_REF=refs/heads/master
 
 ADD https://api.github.com/repos/aria2/aria2/git/$ARIA2_REF version.json
 RUN git clone -b $ARIA2_VERSION --depth 1 https://github.com/aria2/aria2 && \
-    cd aria2 && autoreconf -i && ./mingw-config && make && \
+    cd aria2 && autoreconf -i && ./mingw-config && make -j$(nproc) && \
     $HOST-strip src/aria2c.exe