miniupnpc: Update to 2.1.20190408

Switched to CMake. This allows getting rid of several patches and hacks.

Added PKG_LICENSE information

Rearranged some stuff for consistency between packages.

Added some linked flags for smaller size. Saves around 500 bytes on MIPS.

Signed-off-by: Rosen Penev <rosenp@gmail.com>

net/miniupnpc/patches/100-no-fPIC.patch

@@ -0,0 +1,15 @@
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -38,12 +38,6 @@ if (CMAKE_SYSTEM_NAME STREQUAL "Darwin")
+   target_compile_definitions(miniupnpc-private INTERFACE _DARWIN_C_SOURCE)
+ endif ()
+ 
+-# Set compiler specific build flags
+-if (CMAKE_COMPILER_IS_GNUCC AND NOT CMAKE_SYSTEM_NAME STREQUAL "AmigaOS")
+-  set(CMAKE_POSITION_INDEPENDENT_CODE ON)
+-  target_compile_options(miniupnpc-private INTERFACE -Wall)
+-endif ()
+-
+ # Suppress noise warnings
+ if (MSVC)
+   target_compile_definitions(miniupnpc-private INTERFACE _CRT_SECURE_NO_WARNINGS)