add recipe for libpcre (#2276)

* add recipe for libpcre
* fix flake8 errors

Author: obfusk

pythonforandroid/recipes/libpcre/__init__.py

@@ -0,0 +1,31 @@
+from pythonforandroid.recipe import Recipe
+from pythonforandroid.util import current_directory
+from pythonforandroid.logger import shprint
+import sh
+from multiprocessing import cpu_count
+from os.path import join
+
+
+class LibpcreRecipe(Recipe):
+    version = '8.44'
+    url = 'https://ftp.pcre.org/pub/pcre/pcre-{version}.tar.bz2'
+
+    built_libraries = {'libpcre.so': '.libs'}
+
+    def build_arch(self, arch):
+        env = self.get_recipe_env(arch)
+
+        with current_directory(self.get_build_dir(arch.arch)):
+            shprint(
+                sh.Command('./configure'),
+                *'''--host=arm-linux-androideabi
+                    --disable-cpp --enable-jit --enable-utf8
+                    --enable-unicode-properties'''.split(),
+                _env=env)
+            shprint(sh.make, '-j', str(cpu_count()), _env=env)
+
+    def get_lib_dir(self, arch):
+        return join(self.get_build_dir(arch), '.libs')
+
+
+recipe = LibpcreRecipe()