Add mingw-w64 builds to appveyor.yml

Currently the cygwin autoconf builds only test builds of cygwin-native
binaries, and not mingw-w64 pure windows binaries. The resultant
cygyaml-0-2.dll has a runtime dep on the cygwin1.dll which is generally
not appropriate for the purpose of distribution. Building with mingw-w64
produces libraries with no dependency on the cygwin runtime.

Signed-off-by: Marty E. Plummer <hanetzer@protonmail.com>

.gitignore

 .deps/
 .libs/
-*~
 *.BAK
@@ -4,5 +3,8 @@
 *.BAK
+*.a
+*.dll
+*.exe
 *.la
 *.lo
 *.o
 *.pc
@@ -5,7 +7,9 @@
 *.la
 *.lo
 *.o
 *.pc
+*.so
+*~
 /CMakeCache.txt
 /CMakeFiles/
 /CTestTestfile.cmake

appveyor.yml

@@ -19,5 +19,5 @@
 # Autoconf based in-source build and tests under Cygwin using gcc
 #
 
-# 32-bit
+# 32-bit cygwin build
 - C:\cygwin\bin\sh -c "export PATH=/usr/bin:/usr/local/bin:$PATH && ./bootstrap && ./configure && make && make test && make distclean"
@@ -23,3 +23,3 @@
 - C:\cygwin\bin\sh -c "export PATH=/usr/bin:/usr/local/bin:$PATH && ./bootstrap && ./configure && make && make test && make distclean"
-# 64-bit
+# 64-bit cygwin build
 - C:\cygwin64\bin\sh -c "export PATH=/usr/bin:/usr/local/bin:$PATH && ./bootstrap && ./configure && make && make test && make distclean"
@@ -25,1 +25,5 @@
 - C:\cygwin64\bin\sh -c "export PATH=/usr/bin:/usr/local/bin:$PATH && ./bootstrap && ./configure && make && make test && make distclean"
+# 32-bit mingw-w64 build
+- C:\cygwin\bin\sh -c "export PATH=/usr/bin:/usr/local/bin:$PATH && ./bootstrap && ./configure --host=i686-w64-mingw32 --target=i686-w64-mingw32 && make && make test && make distclean"
+# 64-bit mingw-w64 build
+- C:\cygwin64\bin\sh -c "export PATH=/usr/bin:/usr/local/bin:$PATH && ./bootstrap && ./configure --host=x86_64-w64-mingw32 --target=x86_64-w64-mingw32 && make && make test && make distclean"