Add dynlib support

tests/tpcre.nim

@@ -0,0 +1,35 @@
+import os
+
+import nimterop/[cimport, git, paths]
+
+const
+  baseDir = nimteropBuildDir()/"pcre"
+  pcreH = baseDir/"pcre.h.in"
+
+static:
+  if not pcreH.fileExists():
+    downloadUrl("https://github.com/svn2github/pcre/raw/master/pcre.h.in", baseDir)
+  cDebug()
+  cDisableCaching()
+
+const
+  dynpcre =
+    when defined(windows):
+      when defined(cpu64):
+        "pcre64.dll"
+      else:
+        "pcre32.dll"
+    elif hostOS == "macosx":
+      "libpcre(.3|.1|).dylib"
+    else:
+      "libpcre.so(.3|.1|)"
+
+cPlugin:
+  import strutils
+
+  proc onSymbol*(sym: var Symbol) {.exportc, dynlib.} =
+    sym.name = sym.name.replace("pcre_", "")
+
+cImport(pcreH, dynlib="dynpcre")
+
+echo version()