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/libraries/LibC/CMakeLists.txt

@@ -6,6 +6,7 @@ set(LIBC_SOURCES
 	dlfcn.cpp
 	errno.cpp
 	fcntl.cpp
+	fenv.cpp
 	ftw.cpp
 	grp.cpp
 	inttypes.cpp
@@ -48,10 +49,6 @@ set(LIBC_SOURCES
 
 add_library(objlibc OBJECT ${LIBC_SOURCES})
 target_compile_definitions(objlibc PRIVATE __arch=${BANAN_ARCH})
-target_compile_definitions(objlibc PRIVATE __enable_sse=${BANAN_ENABLE_SSE})
-if (NOT BANAN_ENABLE_SSE)
-	target_compile_options(objlibc PRIVATE -mno-sse -mno-sse2)
-endif ()
 
 target_compile_options(objlibc PRIVATE -O2 -g -Wstack-usage=512 -fno-tree-loop-distribute-patterns -fno-exceptions -fpic -nolibc)
 target_compile_options(objlibc PUBLIC -Wall -Wextra -Werror -Wno-error=stack-usage=)