Strip down libmath. (#45)

libmath is mostly unused (except for trunc(), sin() and cos()), and most functions in it are either very imprecise or downright broken. Additionally, it is implemented in manner that conflicts with C standard. Instead of trying to fix all the shortcomings while maintaining unused functionality, I'm opting to simply remove most of it and only keep the parts that are currently necessary.

Later readdition of the removed functions is possible, but there needs to be a reliable way to evaluate their quality first.

Author: le-jzr

boot/Makefile.common

@@ -243,6 +243,7 @@ RD_TESTS = \
 	$(USPACE_PATH)/lib/posix/test-libposix \
 	$(USPACE_PATH)/lib/sif/test-libsif \
 	$(USPACE_PATH)/lib/uri/test-liburi \
+	$(USPACE_PATH)/lib/math/test-libmath \
 	$(USPACE_PATH)/drv/bus/usb/xhci/test-xhci \
 	$(USPACE_PATH)/app/bdsh/test-bdsh \
 	$(USPACE_PATH)/srv/net/tcp/test-tcp \

uspace/Makefile.common

@@ -108,12 +108,6 @@ LIBCPP_INCLUDES_FLAGS = -I$(LIBCPP_PREFIX)/include
 LIBSOFTFLOAT_PREFIX = $(LIB_PREFIX)/softfloat
 LIBSOFTINT_PREFIX = $(LIB_PREFIX)/softint
 
-LIBMATH_PREFIX = $(LIB_PREFIX)/math
-LIBMATH_INCLUDES_FLAGS = \
-	-I$(LIBMATH_PREFIX)/include \
-	-I$(LIBMATH_PREFIX)/arch/$(UARCH)/include
-
-LIBPOSIX_PREFIX = $(LIB_PREFIX)/posix
 LIBDLTEST_PREFIX = $(LIB_PREFIX)/dltest
 
 START_FILES = $(LIBC_PREFIX)/crt0.o $(LIBC_PREFIX)/crt1.o