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This reduces generated Makefile.in size by 74%.
(217319 bytes -> 56326 bytes)

Automake considers that <prog>_CFLAGS and <prog>_LDFLAGS are
program-specific build rules, and when such are specified, Automake
will generate additional code just to avoid the "generic" and
package-wide AM_CFLAGS or AM_LDFLAGS. (Especially for <prog>_CFLAGS,
Automake will rename generated object files to become "prog-foo.o" and
such, and it's _a lot_ of code to achieve this in Makefile.)

There's no reason for htop to rename intermediate object files. It's
better to make things simpler.
Signed-off-by: Kang-Che Sung <explorer09@gmail.com>