Add Appveyor continuous integration + Remove lib prefix for Windows DLL

.appveyor.yml

@@ -0,0 +1,39 @@
+version: '{build}'
+
+cache:
+- nim-0.17.2_x64.zip
+- x86_64-4.9.2-release-win32-seh-rt_v4-rev4.7z
+- packages -> **\packages.config
+- '%LocalAppData%\NuGet\Cache -> **\packages.config'
+
+matrix:
+  fast_finish: true
+
+environment:
+  matrix:
+    - MINGW_ARCHIVE: x86_64-4.9.2-release-win32-seh-rt_v4-rev4.7z
+      MINGW_DIR: mingw64
+      MINGW_URL: https://ayera.dl.sourceforge.net/project/mingw-w64/Toolchains%20targetting%20Win64/Personal%20Builds/mingw-builds/4.9.2/threads-win32/seh/x86_64-4.9.2-release-win32-seh-rt_v4-rev4.7z
+      NIM_ARCHIVE: nim-0.17.2_x64.zip
+      NIM_DIR: nim-0.17.2
+      NIM_URL: https://nim-lang.org/download/nim-0.17.2_x64.zip
+      platform: x64
+
+install:
+  - MKDIR %CD%\tools_tmp
+  - IF not exist "%MINGW_ARCHIVE%" appveyor DownloadFile "%MINGW_URL%" -FileName "%MINGW_ARCHIVE%"
+  - 7z x -y "%MINGW_ARCHIVE%" -o"%CD%\tools_tmp"> nul
+  - IF not exist "%NIM_ARCHIVE%" appveyor DownloadFile "%NIM_URL%" -FileName "%NIM_ARCHIVE%"
+  - 7z x -y "%NIM_ARCHIVE%" -o"%CD%\tools_tmp"> nul
+  - SET PATH=%CD%\tools_tmp\%NIM_DIR%\bin;%CD%\tools_tmp\%MINGW_DIR%\bin;%PATH%
+  - ps: nuget install RocksDbNative -o "${env:APPVEYOR_BUILD_FOLDER}"
+  - ps: cp rocksdbnative.5.4.6.10/build/native/amd64/rocksdb.dll rocksdb.dll
+  - SET PATH=%PATH%;%CD%
+
+build_script:
+  - nimble.exe refresh
+
+test_script:
+  - nimble.exe test_c
+
+deploy: off

headers/c.h

@@ -52,7 +52,7 @@
 #  dynlib librocksdb
 #  cdecl
 #  if defined(windows)
-#    define librocksdb "librocksdb.dll"
+#    define librocksdb "rocksdb.dll"
 #  elif defined(macosx)
 #    define librocksdb "librocksdb.dylib"
 #  else

src/rocksdb_c.nim

@@ -25,7 +25,7 @@
 
 {.deadCodeElim: on.}
 when defined(windows):
-  const librocksdb = "librocksdb.dll"
+  const librocksdb = "rocksdb.dll"
 elif defined(macosx):
   const librocksdb = "librocksdb.dylib"
 else: