[libc] Fix PATH bug in execvpe, update ewcc includes, speed up amalloc #2173
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When adding "time" to each of the build steps in ghaerr/8086-toolchain#31, it was found that the PATH wasn't being set properly for the
execvpesystem call.Slightly increase speed of amalloc in C86 and AS86 by not searching from the start of the arena each time. This delays free block merging until later, but shouldn't be a problem for amalloc, since it is a fixed size heap anyways. The search was originally set to start from the arena start so that the heap wouldn't continue to grow endlessly before having to sbrk to expand the heap, which is still being done in v7 malloc (debug malloc). Basically we have a classic time/space tradeoff, and amalloc is now tuned for time, whereas debug malloc is tuned for space. Since AS86 does 700+ mallocs each pass, this is worth it and the amalloc arena size is fixed (for now) anyways.
Removes searching for WATCOM headers in
ewcc. Discussed in #2162 (reply in thread).Adds libc/include/watcom/float.h for building basic.c.