Fix building c-ares-1.22.0 and higher under Watcom. (#623)

Update config-win32.h to define HAVE_STDINT_H when OpenWatcom is in use.

Fix By: Douglas R. Reno (@renodr)

Makefile.Watcom

@@ -41,8 +41,8 @@ MD = mkdir
 RD = rmdir /q /s 2>NUL
 CP = copy
 
-CFLAGS = -3r -mf -hc -zff -zgf -zq -zm -zc -s -fr=con -w2 -fpi -oilrtfm -aa &
-         -wcd=201 -bt=nt -d+ -dWIN32 -dCARES_BUILDING_LIBRARY               &
+CFLAGS = -3r -mf -hc -zff -zgf -zq -zm -zc -s -fr=con -w2 -fpi -oilrtfm -aa   &
+         -wcd=201 -bt=nt -d+ -dWIN32 -dCARES_BUILDING_LIBRARY &
          -dNTDDI_VERSION=0x06000000 -I. -I.\include -I.\src\lib $(SYS_INCL)
 
 LFLAGS = option quiet, map, caseexact, eliminate

src/lib/config-win32.h

@@ -87,6 +87,12 @@
 #define HAVE_SYS_TYPES_H 1
 #define HAVE_SYS_STAT_H  1
 
+/* If we are building with OpenWatcom, we need to specify that we have
+ * <stdint.h>. */
+#if defined(__WATCOMC__)
+#define HAVE_STDINT_H
+#endif
+
 /* ---------------------------------------------------------------- */
 /*                        OTHER HEADER INFO                         */
 /* ---------------------------------------------------------------- */