re-pcre: Use ffilib to load libpcre shared library.

re-pcre/metadata.txt

@@ -3,3 +3,4 @@ srctype = micropython-lib
 type = module
 version = 0.2
 author = Paul Sokolovsky
+depends = ffilib

re-pcre/re.py

@@ -1,8 +1,8 @@
-import ffi
+import ffilib
 import array
 
 
-pcre = ffi.open("libpcre.so.3")
+pcre = ffilib.open("libpcre")
 
 #       pcre *pcre_compile(const char *pattern, int options,
 #            const char **errptr, int *erroffset,

re-pcre/setup.py

@@ -15,4 +15,5 @@ setup(name='micropython-re-pcre',
       maintainer='MicroPython Developers',
       maintainer_email='micro-python@googlegroups.com',
       license='MIT',
-      py_modules=['re'])
+      py_modules=['re'],
+      install_requires=['micropython-ffilib'])