[raymath.h] use CLITERAL for MSVC

[brccabral]

I had same error as #1525 , error C4576. I applied the same solution which is to use CLITERAL. Example rlgl_standalone.c does not import raylib.h, so I had to add double check for CLITERAL definition.

[raysan5]

@brccabral thanks but I prefer to not add additional macros just for that use case, in all raymath I already avoided compound-literals usage.

[brccabral]

fyi, just in case someone else has the same problem.

The error was
C:\Program Files\raylib\include\raymath.h(2580,34): error C4576: a parenthesized type followed by an initializer list is a non-standard explicit type conversion

I was getting it because I was targeting the Raylib installation path directly

target_include_directories(${PROJECT_NAME} PRIVATE ${RAYLIB_PATH}/include)
target_link_directories(${PROJECT_NAME} PRIVATE ${RAYLIB_PATH}/lib)

Removing those lines and using find_package solves the error without any modification to raymath.h.

find_package(raylib REQUIRED)

On Windows, make sure C:\path\to\raylib is in your %PATH%