Fix PATH_MAX detection by including sys/param.h if available

Patch sent upstream:
https://bz.apache.org/bugzilla/show_bug.cgi?id=63782

Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>

diff -uNr apr-1.7.0.orig/configure.in apr-1.7.0/configure.in
--- apr-1.7.0.orig/configure.in	2019-04-01 19:40:46.000000000 +0200
+++ apr-1.7.0/configure.in	2019-09-29 17:03:41.803326791 +0200
@@ -1586,6 +1586,7 @@
 AC_SUBST(stringh)
 AC_SUBST(stringsh)
 AC_SUBST(sys_ioctlh)
+AC_SUBST(sys_paramh)
 AC_SUBST(sys_sendfileh)
 AC_SUBST(sys_signalh)
 AC_SUBST(sys_socketh)
diff -uNr apr-1.7.0.orig/include/apr.h.in apr-1.7.0/include/apr.h.in
--- apr-1.7.0.orig/include/apr.h.in	2019-03-22 14:30:31.000000000 +0100
+++ apr-1.7.0/include/apr.h.in	2019-09-29 17:04:54.203815469 +0200
@@ -95,6 +95,7 @@
 #define APR_HAVE_STRINGS_H       @stringsh@
 #define APR_HAVE_INTTYPES_H      @inttypesh@
 #define APR_HAVE_SYS_IOCTL_H     @sys_ioctlh@
+#define APR_HAVE_SYS_PARAM_H     @sys_paramh@
 #define APR_HAVE_SYS_SENDFILE_H  @sys_sendfileh@
 #define APR_HAVE_SYS_SIGNAL_H    @sys_signalh@
 #define APR_HAVE_SYS_SOCKET_H    @sys_socketh@
@@ -206,6 +207,9 @@
 #include <sys/syslimits.h>
 #endif
 #endif
+#if APR_HAVE_SYS_PARAM_H
+#include <sys/param.h>
+#endif
 
 /* __APPLE__ is now the official pre-defined macro for macOS */
 #ifdef __APPLE__