a parameter list without types is only allowed in a function definition

OS: Android 5.0
Architecture: armv7-a (32 bit)
Compiler: clang 4.0

Natively building openlibm on Android produces the following error:

```
➜ openlibm git:(master) make USECLANG=1
clang -fno-builtin -mhard-float -O3 -fPIC -march=armv7-a -std=c99 -Wall -I/data/data/com.termux/files/home/openlibm -I/data/data/com.termux/files/home/openlibm/include -I/data/data/com.termux/files/home/openlibm/arm -I/data/data/com.termux/files/home/openlibm/src -DASSEMBLER -D__BSD_VISIBLE -Wno-implicit-function-declaration -c src/s_cacos.c -o src/s_cacos.c.o
src/s_cacos.c:64:1: warning: type specifier missing, defaults to 'int'
[-Wimplicit-int]
__strong_alias(cacosl, cacos);
^
src/s_cacos.c:64:16: error: a parameter list without types is only allowed in a function definition
__strong_alias(cacosl, cacos);
^
1 warning and 1 error generated.
make: *** [Make.inc:141: src/s_cacos.c.o] Error 1
```

Any ideas?