asm: Delete .func/.endfunc directives

[kraj]

These are useful only with stabs debug format, which is not used on
linux systems, gas ignores them silently, but clang assembler does not
and rightly so.

Signed-off-by: Khem Raj raj.khem@gmail.com

[kraj]

should fix #20 as well

[letrout]

I tried this fix but it didn't work for me (I only tried x86). It looks like the .set of SRC, DST, and SIZE are still not working in the macro?

root@5b56ff072652:/usr/src/app# clang-8 --version
clang version 8.0.1-svn358947-1exp120190423033313.62 (branches/release_80)
Target: x86_64-pc-linux-gnu
Thread model: posix
InstalledDir: /usr/bin
root@5b56ff072652:/usr/src/app# clang-8 -o /tmp/x86-sse2 x86-sse2.S
/tmp/x86-sse2-532c88.s:88:9: error: ambiguous operand size for instruction 'add'
add SRC, 64
^~~
/tmp/x86-sse2-532c88.s:89:9: error: ambiguous operand size for instruction 'add'
add DST, 64
^~~
/tmp/x86-sse2-532c88.s:90:9: error: ambiguous operand size for instruction 'sub'
sub SIZE, 64
^~~~
...