alsa-utils: fix linking against host libc.so/libm.so

alsa-utils: fix linking against host libc.so/libm.so

Caused by expecting ncurses library in /usr/lib.

For some people it's just a warning:
ld: warning: library search path "/usr/lib" is unsafe for cross-compilation
ld: skipping incompatible /usr/lib/libm.so when searching for -lm

And for some people it breaks the build:
ld: warning: library search path "/usr/lib" is unsafe for cross-compilation
/usr/lib/libm.so: file not recognized: File format not recognized

Signed-off-by: Denys Dmytriyenko <denis@denix.org>