Add tests for conan, recurse implies preprocess

tests/libssh2.nim

@@ -0,0 +1,46 @@
+import nimterop/[build, cimport]
+
+const
+  outdir = getProjectCacheDir("libssh2")
+
+getHeader(
+  header = "libssh2.h",
+  conanuri = "libssh2/$1",
+  outdir = outdir
+)
+
+cOverride:
+  type
+    stat = object
+    stat64 = object
+    SOCKET = object
+  
+when not libssh2Static:
+  cImport(libssh2Path, recurse = true, dynlib = "libssh2LPath", flags = "-f:ast2 -c -E_ -F_")
+
+  when not defined(Windows):
+    proc zlibVersion(): cstring {.importc, dynlib: libssh2LPath.}
+else:
+  cImport(libssh2Path, recurse = true, flags = "-f:ast2 -c -E_ -F_")
+
+  when not defined(Windows):
+    proc zlibVersion(): cstring {.importc.}
+
+  {.passL: "-lpthread".}
+
+assert libssh2_init(0) == 0
+
+let
+  session = libssh2_session_init_ex(nil, nil, nil, nil)
+
+if session == nil:
+  quit(1)
+
+libssh2_session_set_blocking(session, 0.cint)
+
+echo "zlib version = " & (block:
+  when not defined(Windows):
+    $zlibVersion()
+  else:
+    ""
+)