userspace: Add empty libm and libpthread

These making porting stuff easier. I could not find a way to tell CMake
that the system does not have threads library

userspace/libraries/LibMath/CMakeLists.txt

@@ -0,0 +1,18 @@
+set(SOURCES
+	dummy.cpp
+)
+
+add_library(libmath-static STATIC ${SOURCES})
+add_library(libmath-shared SHARED ${SOURCES})
+
+target_link_options(libmath-static PRIVATE -nolibc)
+target_link_options(libmath-shared PRIVATE -nolibc)
+
+banan_link_library(libmath-static libc)
+banan_link_library(libmath-shared libc)
+
+set_target_properties(libmath-static PROPERTIES OUTPUT_NAME libm)
+set_target_properties(libmath-shared PROPERTIES OUTPUT_NAME libm)
+
+install(TARGETS libmath-static OPTIONAL)
+install(TARGETS libmath-shared OPTIONAL)