build,win: remove MinGW Makefile

MSYS2 + MinGW-w64 have good support for autoconf, that should be the
preferred way of building libuv under MinGW.

This is a cherry-pick of commit ee949df1cb from the master branch.

PR-URL: https://github.com/libuv/libuv/pull/1850
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>

Makefile.am

@@ -124,7 +124,6 @@ EXTRA_DIST = test/fixtures/empty_file \
              README.md \
              checksparse.sh \
              vcbuild.bat \
-             Makefile.mingw \
              common.gypi \
              gyp_uv.py \
              uv.gyp

Makefile.mingw

@@ -1,86 +0,0 @@
-# Copyright (c) 2013, Ben Noordhuis <info@bnoordhuis.nl>
-#
-# Permission to use, copy, modify, and/or distribute this software for any
-# purpose with or without fee is hereby granted, provided that the above
-# copyright notice and this permission notice appear in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
-# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
-# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
-# OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
-
-CC ?= gcc
-
-CFLAGS += -Wall \
-          -Wextra \
-          -Wno-unused-parameter \
-          -Wstrict-prototypes \
-          -Iinclude \
-          -Isrc \
-          -Isrc/win \
-          -DWIN32_LEAN_AND_MEAN \
-          -D_WIN32_WINNT=0x0600
-
-INCLUDES = include/stdint-msvc2008.h \
-           include/tree.h \
-           include/uv-errno.h \
-           include/uv-threadpool.h \
-           include/uv-version.h \
-           include/uv-win.h \
-           include/uv.h \
-           src/heap-inl.h \
-           src/queue.h \
-           src/uv-common.h \
-           src/win/atomicops-inl.h \
-           src/win/handle-inl.h \
-           src/win/internal.h \
-           src/win/req-inl.h \
-           src/win/stream-inl.h \
-           src/win/winapi.h \
-           src/win/winsock.h
-
-OBJS = src/fs-poll.o \
-       src/inet.o \
-       src/threadpool.o \
-       src/uv-common.o \
-       src/version.o \
-       src/win/async.o \
-       src/win/core.o \
-       src/win/detect-wakeup.o \
-       src/win/dl.o \
-       src/win/error.o \
-       src/win/fs-event.o \
-       src/win/fs.o \
-       src/win/getaddrinfo.o \
-       src/win/getnameinfo.o \
-       src/win/handle.o \
-       src/win/loop-watcher.o \
-       src/win/pipe.o \
-       src/win/poll.o \
-       src/win/process-stdio.o \
-       src/win/process.o \
-       src/win/req.o \
-       src/win/signal.o \
-       src/win/stream.o \
-       src/win/tcp.o \
-       src/win/thread.o \
-       src/win/timer.o \
-       src/win/tty.o \
-       src/win/udp.o \
-       src/win/util.o \
-       src/win/winapi.o \
-       src/win/winsock.o
-
-all: libuv.a
-
-clean:
-	-$(RM) $(OBJS) libuv.a
-
-libuv.a: $(OBJS)
-	$(AR) crs $@ $^
-
-$(OBJS): %.o : %.c $(INCLUDES)
-	$(CC) $(CFLAGS) -c -o $@ $<