Merge pull request #3 from LinuxJedi/master

Add m4 script for Libuv
Add config_extra.m4

Extra stuff for config.h derived from libdrizzle's DDM4
Update for 64
Fix MinGW 64bit compiling

1. Fix bootstrap constant names so static option is used
2. Fix ax_compiler_version to look for 64bit MinGW instead of 32bit
3. Remove PIE from ax_harden_compiler_flags for MinGW

MinGW doesn't support -fPIE at all and -pie relocates main() so MinGW's
own dummy main() because the entry point for the executable (and
therefore the exec does nothing).
Merge pull request #4 from LinuxJedi/master

Disable -Weffc++
Merge pull request #5 from LinuxJedi/upstream

Add config_extra.m4
Merge pull request #7 from LinuxJedi/mingwfix

Fix MinGW 64bit compiling