BuildSystem: Use -O2 for all libraries

I don't know why I had not specified optimization level for libraries.
Only LibImage was using explicit -O3. LibImage doesn't need O3 anymore
as O2 seems to be around the same speed.

userspace/libraries/CMakeLists.txt

@@ -19,6 +19,8 @@ foreach(library ${USERSPACE_LIBRARIES})
 		add_dependencies(libraries ${library_lower})
 		# This is to allow cmake to link when libc updates
 		target_link_options(${library_lower} PRIVATE -nolibc)
+		# Default compile options
+		target_compile_options(${library_lower} PRIVATE -g -O2)
 
 		target_compile_definitions(${library_lower} PRIVATE __enable_sse=${BANAN_ENABLE_SSE})
 		if (NOT BANAN_ENABLE_SSE)

userspace/libraries/LibImage/CMakeLists.txt

@@ -5,7 +5,6 @@ set(LIBIMAGE_SOURCES
 )
 
 add_library(libimage ${LIBIMAGE_SOURCES})
-target_compile_options(libimage PRIVATE -O3)
 banan_link_library(libimage libc)
 banan_link_library(libimage ban)