cgen: fix codegen for generic structinit and generic array return #13256

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1 error, 20 warnings, and 10 notices

invalid expression: unexpected token `=`

incompatible pointer types initializing 'menuitem_t *' with an expression of type 'menuitem_t (*)[4]' [-Wincompatible-pointer-types]

incompatible pointer types initializing 'menuitem_t *' with an expression of type 'menuitem_t (*)[6]' [-Wincompatible-pointer-types]

mixing declarations and code is incompatible with standards before C99 [-Wdeclaration-after-statement]

unused variable 'valera' [-Wunused-variable]

mixing declarations and code is incompatible with standards before C99 [-Wdeclaration-after-statement]

6 enumeration values not handled in switch: 'BT_USE', 'BT_SPECIALMASK', 'BT_CHANGE'... [-Wswitch]

mixing declarations and code is incompatible with standards before C99 [-Wdeclaration-after-statement]

'static' ignored on this declaration [-Wmissing-declarations]

unused variable 'fuck' [-Wunused-variable]

enumeration value ‘BT_WEAPONSHIFT’ not handled in switch [-Wswitch]

enumeration value ‘BT_WEAPONMASK’ not handled in switch [-Wswitch]

enumeration value ‘BT_CHANGE’ not handled in switch [-Wswitch]

enumeration value ‘BT_SPECIALMASK’ not handled in switch [-Wswitch]

enumeration value ‘BT_SPECIAL’ not handled in switch [-Wswitch]

enumeration value ‘BT_USE’ not handled in switch [-Wswitch]

ISO C90 forbids mixed declarations and code [-Wdeclaration-after-statement]

useless storage class specifier in empty declaration

unused variable ‘fuck’ [-Wunused-variable]

the global variable named `state` already exists

the global variable named `p` already exists

the global variable named `y` already exists

the global variable named `oldgamestate` already exists

the global variable named `fullscreen` already exists

the global variable named `p` already exists

the global variable named `y` already exists