Helpers to use system openssl and curl (#2475)

Author: ktf

system-curl.sh

@@ -0,0 +1,10 @@
+package: system-curl
+version: "1.0"
+system_requirement_missing: |
+  curl and its development package are missing from your system.
+   * RHEL-compatible systems: you will probably need "curl" and "curl-devel" packages.
+   * Ubuntu-compatible systems: you will probably need "curl" and "libcurl4-openssl-dev" (or "libcurl4-gnutls-dev").
+system_requirement: ".*"
+system_requirement_check: |
+  curl --version > /dev/null; if test $? = 127; then exit 1; else printf "#include <curl/curl.h>\nint main() {}\n" | cc -xc -lcurl - -o /dev/null || exit 2; fi; exit 0
+---

system-openssl.sh

@@ -0,0 +1,10 @@
+package: system-openssl
+version: "1.0"
+system_requirement_missing: |
+  Please make sure you install openssl:
+   * RHEL-compatible systems: you will probably need "openssl" and "openssl-devel" packages.
+system_requirement: "slc8.*"
+system_requirement_check: |
+  echo '#include <openssl/bio.h>' | c++ -x c++ - -c -o /dev/null
+---
+