Kernel/userspace: rework floating point math

SSE is now unconditionally enabled any where and most of math.h is now
actually implemented. using __builtin_<func> lead to many hangs where
the builtin function would just call itself.

userspace/tests/CMakeLists.txt

@@ -21,9 +21,4 @@ foreach(project ${USERSPACE_TESTS})
 	target_link_options(${project} PRIVATE -nolibc)
 	# Default compile options
 	target_compile_options(${project} PRIVATE -g -O2)
-
-	target_compile_definitions(${project} PRIVATE __enable_sse=${BANAN_ENABLE_SSE})
-	if (NOT BANAN_ENABLE_SSE)
-		target_compile_options(${project} PRIVATE -mno-sse -mno-sse2)
-	endif ()
 endforeach()