cleanup premake links

[mercury233]

• The links directive in Premake applies to a project, not to the workspace.
• Specifying links for a static library has no actual effect.
• On Windows, libraries such as opengl32 and imm32 are already brought in via #pragma comment(lib, ...).
• On Windows, system libraries like kernel32 and user32 are linked automatically by MSVC.
• Starting with glibc 2.34, there is no longer any need to link against libdl or libpthread explicitly.
• libz (zlib) is bundled in the source trees of Irrlicht and FreeType, so it does not need to be linked separately.
• libm (math.h) is a dependency of libstdc++, so it also does not need to be linked explicitly.

[purerosefallen]

          irrlicht.lib(CIrrDeviceWin32.obj) : error LNK2001: �޷��������ⲿ���� ImmNotifyIME [C:\images\builds\nvYJyXaZ\0\nanahira\ygopro\build\YGOPro.vcxproj]
          irrlicht.lib(CIrrDeviceWin32.obj) : error LNK2001: �޷��������ⲿ���� ImmAssociateContextEx [C:\images\builds\nvYJyXaZ\0\nanahira\ygopro\build\YGOPro.vcxproj]
          irrlicht.lib(CIrrDeviceWin32.obj) : error LNK2001: �޷��������ⲿ���� ImmSetCompositionWindow [C:\images\builds\nvYJyXaZ\0\nanahira\ygopro\build\YGOPro.vcxproj]
          irrlicht.lib(CIrrDeviceWin32.obj) : error LNK2001: �޷��������ⲿ���� ImmReleaseContext [C:\images\builds\nvYJyXaZ\0\nanahira\ygopro\build\YGOPro.vcxproj]
          irrlicht.lib(CIrrDeviceWin32.obj) : error LNK2001: �޷��������ⲿ���� ImmGetContext [C:\images\builds\nvYJyXaZ\0\nanahira\ygopro\build\YGOPro.vcxproj]

[purerosefallen]

mercury233/irrlicht@456556d

fine after this.
But next time plz refer it in PR if depending on other repo commits, just as how ocgcore did.