RFR: JDK-8271142: package help is not displayed for missing X11/extensions/Xrandr.h [v2]

[Matthias Baesken]

> Please review the following change.
> On SUSE Linux 15 configure was running into this error, because of a missing X11 header :
> 
> checking for X11/extensions/Xrandr.h... no
> configure: error: Could not find all X11 headers (shape.h Xrender.h Xrandr.h XTest.h Intrinsic.h).
> 
> I wondered about the missing package help output, we should display some hint what packages are missing.
> In help.m4,  PKGHANDLER was detected as /usr/bin/zypper .
> However only the exact string zypper is checked, this should be relaxed.
> Afterwards, the package - help  was working nicely :
> 
> checking for X11/extensions/Xrandr.h... no
> configure: error: Could not find all X11 headers (shape.h Xrender.h Xrandr.h XTest.h Intrinsic.h).
> You might be able to fix this by running 'sudo zypper install libX11-devel libXext-devel libXrender-devel libXrandr-devel libXtst-devel libXt-devel libXi-devel'.

Matthias Baesken has updated the pull request incrementally with one additional commit since the last revision:

  Deal with other package handler tools

-------------

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/4873/files
  - new: https://git.openjdk.java.net/jdk/pull/4873/files/56269b5f..aef78749

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=4873&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=4873&range=00-01

  Stats: 9 lines in 1 file changed: 0 ins; 0 del; 9 mod
  Patch: https://git.openjdk.java.net/jdk/pull/4873.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/4873/head:pull/4873

PR: https://git.openjdk.java.net/jdk/pull/4873