devel branch fails to build when using bash malloc due to missing errno.h include

[Eduardo A . Bustamante López]

I'm running configure with the following flags:

|    ./configure CC=gcc-6

The error I get while building:

|    make[1]: Entering directory '/home/dualbus/local/src/gnu/bash/lib/malloc'
|    gcc-6  -I. -I../.. -I../.. -I../../include -I../../lib  -DHAVE_CONFIG_H 
-DSHELL  -Wall -g -ggdb -O0 -Wno-parentheses -Wno-format-security -DRCHECK 
-Dbotch=programming_error -DMALLOC_DEBUG  -c malloc.c
|    malloc.c: In function ‘xsplit’:
|    malloc.c:472:21: warning: unused variable ‘split_max’ [-Wunused-variable]
|       int nbuck, nblks, split_max;
|                         ^~~~~~~~~
|    malloc.c: In function ‘posix_memalign’:
|    malloc.c:1143:12: error: ‘EINVAL’ undeclared (first use in this function)
|         return EINVAL;
|                ^~~~~~
|    malloc.c:1143:12: note: each undeclared identifier is reported only once 
for each function it appears in
|    malloc.c:1153:10: error: ‘ENOMEM’ undeclared (first use in this function)
|       return ENOMEM;
|              ^~~~~~
|    malloc.c:1154:1: warning: control reaches end of non-void function 
[-Wreturn-type]
|     }
|     ^
|    At top level:
|    malloc.c:669:1: warning: ‘malloc_debug_dummy’ defined but not used 
[-Wunused-function]
|     malloc_debug_dummy ()
|     ^~~~~~~~~~~~~~~~~~
|    Makefile:62: recipe for target 'malloc.o' failed
|    make[1]: *** [malloc.o] Error 1
|    make[1]: Leaving directory '/home/dualbus/local/src/gnu/bash/lib/malloc'
|    Makefile:399: recipe for target 'lib/malloc/libmalloc.a' failed
|    make: *** [lib/malloc/libmalloc.a] Error 1

This is fixed by adding an errno.h include inside lib/malloc/malloc.c

-- 
Eduardo Bustamante
https://dualbus.me/