Fix typo in Linux documentation (#83)

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#60

### Summarize your change.

Fixes an issue repoted by
[@rubikstriangle](https://github.com/rubikstriangle) and resolved by
[tjjackson](https://github.com/tjjackson) where the ncurse-devel is not
properly defined.

The right package name is ncurses-devel, as defined
[here](https://centos.pkgs.org/7/centos-x86_64/ncurses-devel-5.9-14.20130511.el7_4.x86_64.rpm.html)

### Describe the reason for the change.

Typo.

### Describe what you have tested and on which operating system.

Linux

### Add a list of changes, and note any that might need special
attention during the review.

N/A

### If possible, provide screenshots.

N/A

Signed-off-by: Kerby Geffrard <[email protected]>

Author: geffrak

doc/build_system/config_linux_centos7.md

@@ -37,7 +37,7 @@ scl enable devtoolset-9 $SHELL
 Most of the build requirements can be installed using the following command:
 
 ```bash
-sudo yum install alsa-lib-devel autoconf automake avahi-compat-libdns_sd-devel bison bzip2-devel cmake-gui curl-devel flex glew-devel libXcomposite libXi-devel libaio-devel libffi-devel libncurses-devel libtool libxkbcommon openssl-devel pulseaudio-libs pulseaudio-libs-glib2 ocl-icd opencl-headers python3 python3-devel qt5-qtbase-devel readline-devel sqlite-devel tcl-devel tk-devel yasm zlib-devel 
+sudo yum install alsa-lib-devel autoconf automake avahi-compat-libdns_sd-devel bison bzip2-devel cmake-gui curl-devel flex glew-devel libXcomposite libXi-devel libaio-devel libffi-devel ncurses-devel libtool libxkbcommon openssl-devel pulseaudio-libs pulseaudio-libs-glib2 ocl-icd opencl-headers python3 python3-devel qt5-qtbase-devel readline-devel sqlite-devel tcl-devel tk-devel yasm zlib-devel 
 ```
 
 ### Install the python requirements