Fix *_DIR variables for windows
Add VCMI_DLL flag for libvcmi
Delete unused include
fix libvcmi linking
Link with wsock32 lib
fix vcmiclient linkage
define M_PI

M_PI isn't a part of standard and may be undefined.
fix CVideoHandler compilation
Fix windows linkage, also, use SYSTEM_LIBS variable for OS-dependent libraries
disable WIN32 flag for executables, fix previous commit
fix .dll and .exe filenames
link with iconv only when iconv is found
add WIN32 flag for vcmilauncher to hide console window
Rename: vcmi.dll -> VCMI_lib.dll, vcmilauncher.exe -> VCMI_launcher.exe
Oops, reverting CXX_FLAGS back
spaces -> tabulation
fix iconv check
Enable FFmpeg for all platforms
install dlls on Windows
suppress extra GCC warnings on Windows