Add openssl_prefix to Configure and friends

In order to add TLS to the core, we need a library, and OpenSSL is
as ubiquitous as it gets.  So detect where it is with logic
borrowed from Net::SSLeay.

Configure

@@ -1257,6 +1257,7 @@ uvoformat=''
 uvuformat=''
 uvxformat=''
 pidtype=''
+openssl_prefix=''
 prefix=''
 prefixexp=''
 installprivlib=''
@@ -5356,6 +5357,15 @@ none) libs=' ';;
 *) libs="$ans";;
 esac
 
+: see if OpenSSL is available
+for thisdir in $libpth; do
+	p=$(dirname $thisdir) # parent of lib/ directory
+	if test -x "$p/bin/openssl$exe_ext" || test -x "$p/sbin/openssl$exe_ext"; then
+		openssl_prefix=$p
+		break
+	fi
+done
+
 : determine optimization, if desired, or use for debug flag also
 case "$optimize" in
 ' '|$undef) dflt='none';;
@@ -25795,6 +25805,7 @@ nvtype='$nvtype'
 o_nonblock='$o_nonblock'
 obj_ext='$obj_ext'
 old_pthread_create_joinable='$old_pthread_create_joinable'
+openssl_prefix='$openssl_prefix'
 optimize='$optimize'
 orderlib='$orderlib'
 osname='$osname'

Cross/config.sh-arm-linux

@@ -961,6 +961,7 @@ nvtype='double'
 o_nonblock='O_NONBLOCK'
 obj_ext='.o'
 old_pthread_create_joinable=''
+openssl_prefix=''
 optimize='-O2'
 orderlib='false'
 osname='linux'

Cross/config.sh-arm-linux-n770

@@ -959,6 +959,7 @@ nvtype='double'
 o_nonblock='O_NONBLOCK'
 obj_ext='.armo'
 old_pthread_create_joinable=''
+openssl_prefix=''
 optimize='-O2'
 orderlib='false'
 osname='linux'

Porting/config.sh

@@ -985,6 +985,7 @@ nvtype='__float128'
 o_nonblock='O_NONBLOCK'
 obj_ext='.o'
 old_pthread_create_joinable=''
+openssl_prefix=''
 optimize='-O2'
 orderlib='false'
 osname='linux'

configure.com

@@ -1758,6 +1758,14 @@ $   ans = F$EDIT(ans,"TRIM,COMPRESS,LOWERCASE")
 $   IF ans.eqs."decc" THEN Has_Dec_C_Sockets = "T"
 $ ENDIF
 $!
+$! If openssl is a concealed device name, that "device" is the root
+$! of our OpenSSL installation.
+$ IF F$TRNLNM(F$PARSE("openssl",,,"DEVICE") - ":",,,,,"CONCEALED")
+$ THEN
+$   openssl_prefix = "/" + F$PARSE("openssl",,,"DEVICE") - ":"
+$ ELSE
+$   openssl_prefix = ""
+$ ENDIF
 $!
 $! Ask if they want to build with VMS_DEBUG perl
 $ echo ""
@@ -6675,6 +6683,7 @@ $ WC "obj_ext='" + obj_ext + "'"
 $ WC "old_pthread_create_joinable='" + old_pthread_create_joinable + "'"
 $ WC "oldarchlib='" + oldarchlib + "'"
 $ WC "oldarchlibexp='" + oldarchlibexp + "'"
+$ WC "openssl_prefix='" + openssl_prefix + "'"
 $ WC "optimize='" + optimize + "'"
 $ WC "osname='" + osname + "'"
 $ WC "osvers='" + osvers + "'"

win32/Makefile

@@ -232,6 +232,15 @@ EXTRALIBDIRS	=
 #
 #EMAIL		=
 
+# Try to locate OpenSSL installation, if any.
+!IF EXISTS($(PROGRAMFILES)\OpenSSL-Win64\bin\openssl.exe) && "$(WIN64)" == "define"
+OPENSSL_PREFIX = $(PROGRAMFILES)\OpenSSL-Win64
+!ELSEIF EXISTS($(PROGRAMFILES)\OpenSSL-Win32\bin\openssl.exe)
+OPENSSL_PREFIX = $(PROGRAMFILES)\OpenSSL-Win32
+!ELSE
+OPENSSL_PREFIX =
+!ENDIF
+
 ##
 ## Build configuration ends.
 ##
@@ -822,6 +831,7 @@ CFG_VARS	=					\
 		"libpth=$(CCLIBDIR:"=\");$(EXTRALIBDIRS:"=\")"	\
 		"libc=$(LIBC)"				\
 		"make=$(MAKE_BARE)"				\
+		"openssl_prefix=$(OPENSSL_PREFIX)"	\
 		"static_ext=$(STATIC_EXT)"		\
 		"usethreads=$(USE_ITHREADS)"		\
 		"useithreads=$(USE_ITHREADS)"		\

win32/config.gc

@@ -955,6 +955,7 @@ nvtype='double'
 o_nonblock='O_NONBLOCK'
 obj_ext='.o'
 old_pthread_create_joinable=''
+openssl_prefix=''
 optimize='-O2'
 orderlib='false'
 osname='MSWin32'

win32/config.vc

@@ -954,6 +954,7 @@ nvtype='double'
 o_nonblock='O_NONBLOCK'
 obj_ext='.obj'
 old_pthread_create_joinable=''
+openssl_prefix=''
 optimize='-O'
 orderlib='false'
 osname='MSWin32'